In my library randomly movie names will show as how night at the museum does in the attached photo even though it is named properly via filebot using plex output. im not sure where plex even gets the filename from since its not listed anywhere like this. again its completely random. theres more than a handful like this, yet the majority are right. all files are named properly.
There is embedded metadata in your MP4/M4V file throwing Plex into a tailspin.
the LMA Hack tells Plex to stop looking in your files for embedded titles and to concentrate instead on your good file names.