QMM password not syncing from target to source

We have two domains, one source and destination, the synchronization of passwords in both directions was working, we even started the migration process and  now password synchronize does not work for few accounts from target  to source. We have Office 365 and an AD Connect in the origin, that's why we need the synchronization in both directions to work. The configuration of passwords at GPO level in both domains is the same.

what is the best setting for syncing password so source and  target should have latest password. if user changes password in target it should update source and if password in source is changed target password should be updated.