@Qoo -
The message mix-up issue is known to us, and we're working to fix it this very moment.
We hope to release a fixed version soon - we apologize for the temporary inconvenience
@rjr1049 -
Uninstall + reinstall should solve this issue, however it will cause chat history to be deleted. The issue is caused by a collision between Viber's "old" database, and the new database of version 2.1.3 and above.