OwnCloud versioning brings up older versions and gives clients an error message

Steps to reproduce
1. Running server version 8.2.7
2. Running client version 2.2.3

Actual behaviour
From time to time clients get a notification of a back-up detection. This gives the user the option 'Keep Local Files as Conflict' or 'Normal Synchronization'.

However nobody restored a backup recently.

Server configuration

Operating system: Ubuntu 14 LTS (not updated -> system updates etc.)

Closing as a duplicate of the following threads. There you will find a redirect to an still open bugreport to the sync client developers.