I’ve used Plex for years but the last few weeks it’s started doing something new.
I have watched Breaking bad and marked watched BUT it keeps putting it at S03E01 to Continue watching and I’m on Season 3 of Only fools and horses and keeps marking most Watched and telling me to watch next which is S06E01.
I mark them watched and Unwatched, deleted series from HDD on PC and re added and cleared PC Cache but it keeps doing it.
Only with these 2 shows and first time it’s ever done this in years.
See if you have other Plex clients/ browser tabs with Plex player in perpetual Pause mode of these episodes.
Do also check the “watched” status of all episodes of these shows. It can sometimes have unexpected results if you have episodes marked watched/unwatched out of order.
I’ve looked there’s no one else watching and noting on pause, I’ve selected the entire show and said mark as played and it does then after a rescan it returns to the same state in same episodes.
I say remove from continue watching and it does then again later it re appears.
Or inspect them yourself. Take a look at the Plex Media Server.log file and seek for messages about database corrupt or malformed.
If you find these, you may have to repair your database. https://support.plex.tv/articles/repair-a-corrupted-database/
You need to close the player on that client. It is clearly reporting a Paused playback to the server, causing the playback position of that episode to always getting reset to a particular position.