Problems with On Deck

I accidentally watched the last episode of Pawn Stars, and now the older episodes won’t show up on the On Deck list, so I have to manually find the oldest episode.
Do anyone know how I can reset the On Deck position for that show? I tried marking everything as watched, then as unwatched, but its not helping.
Watching an earlier episode doesn’t reset it to that position either.

If you have set everything as watched and then as unwatched, the watching progress is lost. You overwrote it.
All you can do is to mark all the previous episodes as ‘watched’, until you reach the current episode.

You can mark whole seasons as ‘watched’.
If you hold down the CTRL / CMD key while clicking with the mouse on the episode posters, you can mark several episodes at once as watched/unwatched.

I hadnt marked the rest of the episodes as watched. I accidentally watched the latest added episode, and even when I watched the old eat unwatched one, it didnt reset the “on deck” to the next episode.

Go to that newest episode that you watched, and set it as Unwatched. That should allow the earliest episode that is marked as Unwatched, with no Watched episodes following it, to appear in your On Deck area.