Diggz Team

Widgets like TMDBh Next Episodes and others use trakt.tv Progress, if you get episodes you don't want, you have to remove the shows.
There are other ways (eg via Umbrella -see above page- which is faster).
Make sure you checked your entire TV collection (with 'Hide Watched' off) to know what to remove, so unnecessary episodes will no longer appear in your Progress folders and widgets.
Log in to trakt.tv and click on your avatar on the upper right, then select Progress.
Scroll the list until you find a show you don't have on your collection, click on the second icon (Hide) next to the title, and confirm to hide it.