Plex not tagging TV shows correctly, even when named correctly

I still am having trouble with this. I have even gone to the extent of removing ALL of the Doctor Who content, going through a full rescan and cleaned bundles, but Plex still seems to think I have some Doctor Who files:

Yet, when I click on the icon above I get a screen saying there are no episodes:

So it looks like something isn’t being cleared from the database, no matter how I try to wipe it. How can I completely reset the database? The instructions linked at The Plex Dance ™ are insufficient.