This is usually due to the way SVN manages mergers. It adds a property to the file, which says from which branches / revisions the file was merged.
Since my experience (or lack) of svn is not very good at tracking mergers, I use the flag --ignore-ancestrywhen merging. This usually fixes these problems and does not update the mergeinfo property.
Check on the right, there are a few more questions related to the same question.
And if you want to try something new, move your repository to Mercury or git to avoid any nonsense of merging :).
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