Completely ditch TVDB and use TMDB only.
There is a lot of hotchpotch in TV Shows on Trakt. Please use TMDB only. We users will keep fixing stuff on TMDB, automatically Trakt will become organized as well.
I appreciate the desire, but unfortunately it isn’t quite that easy. We want to make sure to preserve viewing histories and if the seasons or episodes don’t match perfectly, we’re creating duplicates. Also, some shows don’t meet TMDB’s bible for contribution.