Issue: Document filter does not filter on correct tags
Applicable browsers: Any browser
In some cases, we’ve noticed that the document filter will not work for documents whose terms have been moved from one node to another in the term store.
The solution is to force SharePoint’s term set sync to do a resync of the effected term, see solution on this page: Renamed, merged or moved terms are not successfully synchronized to SharePoint sites.
We have communicated this issue to Microsoft and hope they will release a fix for it soon.