Fake (=former) LiveTrack recipients popping up in device menu

I spotted in the device menu that in the LiveTrack recipients list instead of the one real email address there were more. Namely three

Eg. one former LiveTrack recipient, which I deleted months ago in GC app. And even the email address of the real recipient is in the list was twice.

I checked multiple times in GC app and there was just one recipient in Livetrack recipients list. I even removed that email address, synched, added again and re-synched.

When I removed the real one, also the list in the device menu empied. When I adeed again after the sync there was only one, but later (within a minute) all the fake items re-appeared.

From where do they come? From that part of GC cloud which my GC app cannot see? Or from some corrupt files of my 530?

I do not want to do factory resets just as a hopeless try. Only if it solves the problem.