@tmm1 Digging a bit more into this, I've figured out when filtering for Unwatched, the 6 series it displays are all series that Channels directly recorded. The 11 series it is missing are all independently downloaded/ripped eps. However, if a recorded by Channels series exists and you also have outside eps, those outside eps will get included in the Unwatched series filter.
For example, in my screenshot, you see Billions has 15 unwatched eps. When I look at the details for the series, it shows this:
As a test, I did the following:
Action - Filter Setting - Result
All Shows Unwatched - All Shows - Displays w/ 15 unwatched eps (correct result)
All Shows Unwatched - Watched - Displays w/ 15 unwatched eps (incorrect result)
All Shows Unwatched - Unwatched - Displays w/ 15 unwatched eps (correct result)
All Shows Watched - All Shows - Displays w/ 0 unwatched eps (correct result)
All Shows Watched - Watched - Displays w/ 0 unwatched eps (correct result)
All Shows Watched - Unwatched - Does not display the series at all (correct result)
Only Rec Eps Marked Watched - All Shows - Displays w/ 2 unwatched eps (correct result)
Only Rec Eps Marked Watched - Watched - Displays w/ 2 unwatched eps (correct result)
Only Rec Eps Marked Watched - Unwatched - Does not display the series at all (incorrect result)
Only Outside Eps Marked Watched - All Shows - Displays w/ 13 unwatched eps (correct result)
Only Outside Eps Marked Watched - Watched - Displays w/ 13 unwatched eps (correct result)
Only Outside Eps Marked Watched - Unwatched - Displays w/ 13 unwatched eps (correct result)
So, yeah, it's correct sometimes and not others. But the bigger issue seems to be that it simply doesn't include non-Channels recorded shows as a whole. For example, I ripped the entire Battlestar Galactica series from DVD, and the only time BSG displays is when the filter is set to All Shows or Watched (since I've watched some episodes), but Unwatched never displays the show.
Lastly, I upgraded to the latest beta, 2022.02.07.2029
Cheers!