Disable Verbose Logging - unless specifically instructed to turn it on. Verbose Logs are so littered with useless info they’re of little use - unless looking for something specific.
You need to name your files according to the packaged instructions:
https://support.plex.tv/articles/categories/your-media/
Movie Folders - and the Movie therein - need to be the same ‘Correct’ Name. One Movie per folder - unless you have a specific use case (and you don’t).
The Correct Name and Structure:
Zombieland Double Tap (2019)/
.......Zombieland Double Tap (2019) [Put Crap Here].mkv
(Plex ignores Crap in [Brackets])
Since you may have had movies of different names in the same folder, for some time, you need to remove all movies and folders that even remotely look like the movie in question, rename your files correctly, restructure them correctly and Plex Dance the entire shebang:
ALL Steps, in Order, or it simply won’t work.
‘Named The Same as They’ve Always Been’ means nothing to us. Eventually, like right about now in your case, Poor Naming and Structuring comes home to roost. It’s home.
‘Named Correctly’ is a completely different animal and the one that’ll work when the other one won’t.
You can Plex Dance a movie at a time, if you don’t have many, but I really would investigate software that would help bring your naming and structuring into a more ‘standard and correct’ configuration or things like this will go on, and on, and… on.
As for the Harry Potters - hunt down and destroy every Harry Potter anything and Plex Dance new ones, named and structured correctly. See what that does.