BUG: highlights aren't synced between mobile devices

L.A.

After the last beta-update (6.1.0) highlights aren't synced between my mobile devices (from Android 5.0.2 phone to 6.0.1 tablet, both German UI). Preference-settings are OK. However, syncing of highlights works between mobile and desktop. 

Additional info:

• the highlights are from yesterday after updating to the new beta
• when I highlighted some text it wasn't marked as highlighted, but shown as highlighted in the highlight-history on the mobile-device I worked on, whereas it did not show up in the history on the other mobile-device.

L.A.

Problem solved after uninstalling and reinstalling the app.