Why is the folder name in Windows Explorer different from the command line or cygwin?

I use Robocopy to back up my computer files. I used the following command:

robocopy C:\Users\ J:\backup\ *.* /a /XD AppData /XJD /R:0 /s

When I browse my J-drive in Windows Explorer, I see a folder named J: \ Users \, but when I use dir from the command line, I see a folder named j: \ backup. Backup files and user look the same. I also tried to look at the contents of the J-drive in cygwin and see the backup folder, but I do not see the Users folder. What's happening? Is robocopy the culprit?