Its a matter of the Plex scanner confusing files. If you want an easy way to cleanup your files Ill copy/paste my standard response. files like 9.mkv are so vague that it Plex takes a random stab in the dark at matching with poor results. I would Plex Dance the affected files using:
If you want to save yourself a lot of time I would recommend using Download - tinyMediaManager and use ${title} (${year}) {imdb-${imdb}} as the new name format.
