What does this mean when the Mercurial / TortoiseHg graph line runs without a dot?

I work in a team with 3 other developers, and for the most part we all work on the same Mercurial repository in anonymous branches and periodically merge with the default branch. Yesterday, one of the other developers decided to update the previous version and continue working from there. After completing our changes, and then pulling and merging, we noticed some strange behavior with the graph (see image below) in TortoiseHg, which we had never seen before. In principle, we have some lines of graphs that do not end with a dot, but simply follow and never merge back into any other branch. What does this mean in plain English?

UPDATE: I am prone to "error", but on the last chart I have a similar line that works its way along the entire chart and does not seem to serve any purpose whatsoever. Here it can be seen in blue to the left of change set 0 at the very bottom of the graph.

UPDATE: ASCII output from hg glog is output. The TortoiseHg graph has unrelated lines around the 281 turn, but here it looks great. So ... a mistake?

@    297 277f72eb6da3
|\
| o  296 eb2505095090
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o |  295 7f44b8354252
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| o  294 b4b7e3fa683a
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| o    293 e2e16967987f
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+---o  292 e5d13c14417e
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| o  291 f12a6a3fa06a
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| o  290 ea93c6fe6244
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| o  289 fbc2e750a98d
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| | o  288 987fd06bad0d
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o | |    287 b91bd794ca84
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| +---o  284 6e4bee3dbe42
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| | +-----o  258 16f7379774e6
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| | o-----+  253 545bf895343f
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+-------o  250 242c8aa8ef4c
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o---+ |  240 aa4bcf158ebf
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o-----+  234 d364e47f38f7
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+---o |  221 fb87da613f35
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|/ / /
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o | |  206 a5d85dc7a37d
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o | |  205 c507e4c0b02c
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o | |  204 37f4277a8322
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o | |  203 15e563293c07
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o | |  202 b3994704a0d2
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o | |  201 d618083c13be
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o | |  200 2d2556ff4171
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o | |    199 da90fbeddd3d
|\ \ \
| o | |  198 6f0a41ac629d
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| o | |    197 947cf457aec0
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| | | o | |  194 c5464c4f2e06
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o | | | | |  193 507df365099a
|/ / / / /
o | | | |  192 a9fe0c0683f8
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o | | | |  191 f082f83ac787
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o-----+ |  190 d906303e387e
 / / / /
| | o |  189 4e73c2c778ae
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| | o |  188 1b1bed6cbd42
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| | o |    187 54a9d626a419
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| | | o |  186 c5c153dfc6af
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| | | o |  185 664dac360636
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| | o | |  184 cb3516daf65a
| | |\| |
| | | o |  183 be8618ea400f
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+-----o |  182 ba3cf50882b8
| | | | |
| | | o |  181 174185b1ba35
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| | | o |    180 9ac8a79d9e33
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| | | | o |  179 e1f1aa639833
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| | | | o |  178 6a181fbfdfd1
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| | | | o |  177 f9dbe5b840e8
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| | | | o |  176 f8124c6d8f0d
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+---o | | |  175 ddadb145b45d
| |  / / /
o | | | |  174 e6a3a5be7dfb
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o | | | |  173 6019de4fe022
|/ / / /
o | | |    172 69543cb61e07
|\ \ \ \
| o-----+  171 bb965fd8cc62
| | | | |
| | | | o  170 6f4a86f501b6
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| o | | |  169 87049b28b2b3
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| o-----+  168 8da5cb2b368b
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| o | | |  167 152455050b5a
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| | | | o    166 7ceb485c912c
| | | | |\
| | | | | o  165 a8b596b6de4c
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| | | | o |  164 a313f1547645
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| | | | o  163 a163a07da88d
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| | | | o    162 87b0f153587f
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| | | | | o  161 2357d8eb4980
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| | | | o |  160 b1537d8a39bf
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| | | | o  159 8b27dae8df5d
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| o | | |  158 de823bfc1989
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| o | | |  157 2dd992a51584
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| o-----+  156 60f95e4043f5
|  / / /
o | | |  155 51b8e3b4fd6a
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o | | |  154 b86455939248
|/ / /
o | |  153 e743a0f603b4
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o | |  152 4b0cc0b34822
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o | |  151 8d2cfa92c93c
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o | |  150 06e798e33eb6
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o | |  149 26e0f58a4d6c
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o---+  148 65e44b7abc91
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| | o    147 c63d37b9ae4c
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| | | o  146 ec2c8913a049
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| | o |  145 15329a633aee
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| | o |  144 c76ce1dbf93a
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| | | o  143 ff84766aa577
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| | o |  141 019500da31f1
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| | | o  140 06a8ad379f5e
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| | o |  139 eb3c772f1001
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o | |  138 768bd3b7b6c3
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o | |  137 35cf9e3d7a0c
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o---+  136 f9c585b79ad9
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o---+  132 39bc6332d845
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| | o  131 8d66f4c7c74f
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| | o  130 365fc4ca49e1
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o | |    129 8c5cb2f4b19f
|\ \ \
| o \ \    128 467c0eff23ac
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| | o | |  127 0668cb6e6242
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o-------+  126 b7bbe1d3a2ec
|/ / / /
| | | o  125 c143bb4224ba
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o-----+  124 b42aa5b476fb
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| | | o  123 d82ef3f041c5
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o | | |  122 78c228ad9a5b
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o | | |  121 052788cf6433
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o-----+  120 244aeec899b7
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| | | o  119 6619c0e187ea
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| | | o  118 6606e146cd64
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| | | o  117 c4e618f32d28
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o---+ |  107 8572b030cf77
 / / /
| o |  106 bb4502305aca
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| o |    105 d96d821b534d
| |\ \
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| o | |  101 c091f79e3ee1
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| |\| |
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|  / /
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| |\ \
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| +---o  96 3e495267e054
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| |\|
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| | |\
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|  / / /
| | o |  72 63d6740cfca1
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| | | o  71 10552c394128
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+-----o  70 ffe28df906ab
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| | | o  69 a019ddaf5c06
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o-----+  68 02a15134f0f0
 / / /
+---o  67 66ab16da1b2a
| | |
| | o  66 b142552eebfa
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o | |  65 09e886012c7d
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o | |    64 93e065498229
|\ \ \
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| o | |  60 f5eb75689c2b
| | | |
+---o |  59 3c78ebd48f5c
| |  /
o | |  58 1de8ae72a17b
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o---+  57 1860e0b3ddf7
| | |
| | o  56 09f986de06f3
| |/|
| | o  55 298378e863f7
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o | |  54 c8845178c55a
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o | |  53 a8607dca99af
|\| |
| o |  52 6847c83e2363
| |\|
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 / /
| o  49 10be7348662e
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| |\
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| | | o    45 cca54c005934
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| | | | o  44 103ea35092bd
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| o | | |  43 abfcfd345f80
| |/ / /
| o | |    42 032d23dce3f2
| |\ \ \
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| | o | |  40 4a8d9fadbfd6
| | |\| |
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|  / / /
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| | o | | |  28 bde64f434ea4
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| | o / /  27 f485e75cf5d4
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| | o |  26 9ee9ae5f2e88
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| | o |  25 d84755f11cbb
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| | o |  24 6b18f0bfd1ad
| |/| |
| o | |    23 a9e5b42c63f8
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| | o | |  22 c418bc6aefd4
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| +---o |  21 b18bee1030dd
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| o---+  20 1f74cf1be5cb
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| | | o    19 aeb2ff3af383
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+-------o  18 f5925021afc7
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| o---+  17 6537855915e4
|  / /
| | o  16 840f7a7e330f
| |/
| o  15 f7ef935faa2f
|/|
| o  14 764790125b62
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| o  13 d2dcd73d9969
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| o  12 7105b369799d
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o |    11 5899825e7281
|\ \
| o |  10 c44c5e16f610
| |/
o |  9 ce2bdb2e874f
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o |  8 5be3c02d3f6c
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o |  7 ccf737af4cf8
|/
o  6 bc52ab3333a6
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o  5 0b7025c2ce5f
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o  4 6b7507c691ac
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o  3 dde8ba20c41a
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o  2 b486cb6a5323
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o  1 c25eb3375713
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o  0 026059ab87d2