This is based on how the show is categorized in TheTVDb and The Movie Database. There’s been an entire thread about this some days ago. Apparently they started treating the new airing as new seasons of the old show and have changed that since.
With the new agent you can include the year a show first aired and an external reference (e.g. TVDB/TMDB/IMDB ID) to deal with stubborn mismatches.
