You can't have two folders with the same name in the same directory - something must be different (maybe an underscore at the end of one or something else). I have no idea how or why this happened. When you scroll through each of the folders are they identical in terms of contents (same folders, same files, you can open files from both folders,...)? I'm not familiar with robocopy so I'm not sure if that was responsible (though it seems likely). If they are identical in all respects, just delete one and use the other one (or better, remame one to something else and save it elsewhere "just in case" - at least until you're sure the folder you selected is working properly and there are no problems. I'd give a month and then delete the other folder.
If you see only one in cmd then move some file to a different directory and then ccheck on Windows Explorer to see in which folder the change occurred (and verify it didn't occur in both). Then you'll know which folder to use and which to rename are indicated above.
I hope this helps.
Good luck.
Lorien - MCSE/MCSA/Network+/A+ --- If this post helps to resolve your issue, please click the "Mark as Answer" or "Helpful" button at the top of this message. By marking a post as Answered, or Helpful you help others find the answer faster.