Once an update has been done, you may probably see that a completely different word and definition pop up once you tap on your "Favourite" listed word. This happens when your "Favourite" word list is not auto-remapped.
Once you update your database, a notification will appear, telling you to auto-remap your "Favourites" list. After that, tap on the burger menu and go to the "Favourites" section>>Tap on the three dots>>Auto-remap.