"File Exists" Error When Creating New Folder in Explorer

Got an odd one for you:

A user is in File Explorer, right-clicks, and tries to create a new folder. She gets an error that says File Exists.

There is already a folder called New Folder in the folder that she's currently in. As well as a New Folder (2), New Folder (3) etc. If I delete the folder called New Folder, and she tires again, it works, and Windows creates another folder called New Folder.

But why isn't it sequentially creating the next New Folder (#) in line, the way its supposed to?

This is on a mapped network connection to an FTP, if that matters. But numerous other users connect to that same FTP, and none are having this problem.

Any ideas?

Been digging on Google, haven't seen anyone even talking about having had this problem...

Can you try creating new folder within Safe Mode to see if issue persist.

You don't say if the remote location is NTFS or some other filesystem but have a look at the ownership/permissions of the "New Folder" that exists.

Perhaps she isn't authorised to see it but on creation it fails as the folder exists so the filesystem (naturally) blocks the creation of a new one with the same name.