Windows Seafile client and local sync

I have 2 seafile servers internal and external and a number of seafile clients pointing to these servers, sometimes both at the same time. This all works well. The issue i have is with the local sync (which is what i want so the users can work offline). I have ignored the default sync location as its not suitable for me . instead i have set custom ones per account on each client. The issue is these sync locations appear to become desynced, even if set in the advanced options no to desync.
I’m not sure of the exact reason, it may be to down reboots or different users logging into the same laptop.
This issue has occurred on client 5.1.4 and 6.0.0
any tips for tracing the issue.