Yea, it’s just that some veterans and ninjae recommend a folder for each movie - and veterans and ninjae agree stuff in [Brackets] is absolutely ignored by Plex while what’s after the ‘-’ may be, sometimes, depending.
Also, if you don’t Plex Dance this item - it may never behave:
… and that’s every step - in the order described - with no deviations - whatsoever.
This usually happens if you changed the library’s default agent inbetween.
So you now have e.g.
old version = Plex Movie
new version = TheMovieDatabase
If the two versions are matched with different agents, they are two different movies for Plex.
As Juice mentioned, you can either ‘Merge’ them or perform the Plex Dance with both. The result will usually be the same.