I am guessing that some entries were created in the DVR Recording Priority list during the period between 25th May and 1st June when we had the issue
If the problem is still there, could you get me the xml responses for these requests which you can put in a browser on a machine on the local network
http://192.168.124.xxx:32400/media/subscriptions?X-Plex-Token=xxxxxxxxxx
http://192.168.124.xxx:32400/media/subscriptions/scheduled?X-Plex-Token=xxxxxxxxxx
Substitute the actual server local ip address octet for the xxx
Substitute server security token for the xxxxxxxxxx
you can find the server security token either by following the steps here Finding an authentication token / X-Plex-Token | Plex Support or getting it from the server settings Preferences.xml file from PlexOnlineToken
Copy each of the two responses into a separate txt file and attach here
I just added a new recording schedule for The Twilight Zone and the poster shows in the DVR Priority