Users are raising issues that the filter criteria that was working fine till last 2 weeks are not showing the correct result now due to the "Resolution'' field.
I'm not able to identify the exact cause here, one user has raised the issue that the dashboards based on the below query were running correctly 2 week back until 19th Dec but now after coming back from his holidays, its not working as expected (like it was giving results earlier)
This query retrieves only 6 results when 'resolution = Unresolved' is added:
(project = "Global Markets IT" OR labels = GM2019) AND Status not in (Cancelled, Closed, "moved to production") AND resolution = Unresolved
And, 187 result, if 'AND resolution = Unresolved' is removed from the query
User is adamant, that the dashboard created based on this query was retrieving the results correctly earlier and not now.
What can be the possible cause for this. Snapshot attached for 

your reference.
Thanks.