Media files registered double for same movie

[ajcdk 3]

Hi

I've just come across a strange bug which has happened with the last 2 movies added to my library. The movies show that they have 2 different files, except it's the exact same file. Same path, name, size, added date - everything.

I've verified that there is only the one file present, and tried scanning library files.
I then tried to delete one of the movies from the library, which resulted in only one of the file versions disappearing, but the movie still existing and still showing the "duplicate" icon. The actual file disappeared too, which indicates that the other file is a "ghost" file somehow.

I'm not really sure where to look here, so I'd greatly appreciate any pointers!