One of the downsides of closed source apps is you can’t see what it’s doing or file a ticket to fix bugs. This just came up with me with YakiHonne (npub1yzv…rf8q) which has a bug where it overrides your contact list if you follow someone in the yakihonne app. Hopefully it’ll get fixed fast.
In general we have a nostr problem with replacable list events and how easy it is for apps to override and whip out lists.