FileBot tries determine the series/movie name from the files in various ways. One of these methods works by trying to filter out the series/movie name from the filename. To help with that and various other aspects that try to make sense of file/folder structures there's a blacklist of text patterns that are known to be just clutter/garbage/noise that can and should be ignored.
If auto-detection is thrown off due to some garbage in the filename like website/tracker names, folder names, categories, language tags, etc just post it here and I'll add to the list.
The list of blacklisted text patterns is maintained here:
https://github.com/filebot/data/blob/master/query-excludes.txt

FileBot will update its local cache from the data online once a week.