Music Folder Names Not Consistent

By any chance, is your player’s USB mode, under Settings, set to MTP mode?  MTP mode can fool around with file, etc. names.  MSC mode (the other option, besides Auto, which can switch between the 2 modes and cause later confusion–I’d avoid it) doesn’t typically have this issue and can be your solution (first delete the content on the player, set to MSC mode, and re-transfer).  Note, however:  MTP mode generally is needed for playing DRM’ed files (e.g. Rhapsody), in case you have those.