The scanner/agent are set per library.
You can change if Plex uses the TVDB or TheMovieDB for episode ordering on a per-show basis. Edit the show, choose Advanced, and look for Episode Ordering. Choices are Library Default, TheMovieDB, or TVDB Aired/DVD/Absolute. To edit the show at the library level, mouse over the show poster and click the pencil icon in lower left corner (see this post for an example). You can also choose the pencil icon on the TV show page.
Unfortunately, that won’t help with “…Peyton Manning.” Unless I missed it, the show is not listed at TheMovieDB.
Give Plex a few days to work on this. It is the weekend and some people were probably still on vacation this week.
