Caches sometimes contain stale data, so it is a good idea to clean them out occasionally.
Most Android devices have two caches that affect the app so clearing or resetting them both is a good idea.
(The exact location and naming do vary a bit between devices but, in general, they are here:
1. General Cache: Go to [Your Android device ] > Settings > Storage > Clear Cache.
2. "App name" Clear Data: Go to [Your Android device ] > Settings > Apps ( Applications ) > Presence > Storage >Clear Data.
On older Android versions the "Clear Data" is on the main app page.
That helps Presence and your device in general.