Replaced items show a 2nd persisting file path as "Unavailable"

[K_MEDIA]

Ok, problem solved. After reading this post..

I have to remove unavailable tv-show files manually

Edit the library go to the Add Folders tab ensure that every folder path on this tab is a) existent b) accessible to Plex server c) not completely empty If that doesn’t change anything, repair the database files: Stop Plex server using its task tray icon open a command line window (cmd.exe) and run this .bat file: https://github.com/ChuckPa/DBRepair/tree/master/Windows

I checked and realised I had an empty folder listed in the library paths (which I had stopped using around the same time as seeing this issue!). After removing this empty folder and rescanning, the issue disappeared. I now have the correct number of genuine duplicates.

Thanks to everyone that helped.