Wait, are you going to leave us hanging? Just in case I’m ever faced with an old FP hanging around (I know I’ve had them) or something similar, how did you get rid of it?
It was a unique situation. My sister is a West Coast CM. When we go to WDW, she can’t just sign in, she has to assign Main Entrance Guest passes to guests, that show up in MDE like an AP. These aren’t the same as comp passes that can be used only once by anyone. They are permanent, and transferable and once assigned, these stay in your MDE and can be used by the guest as often and as many times as the CM signs in with them, until they are unassigned or reassigned to a different guest.
Anyway, the Main Entrance Guest pass was still also showing up on my MDE from 2019. Asked my sister to go back and unassign the Pass again and then deleted and reinstalled MDE and it was gone. I think it was just a weird glitch.
I had the same issue recently. I had reservations from 2019 showing up on my MDE. I logged out, reloaded, and they would not go away. Then today they were finally gone. I guess it took the system a couple of years to update.