This is a know issue with GPOADmin.
In the Difference Report, filters are not supported for GPO Preference settings.
A Defect request has been submitted for this issue.
Defect ID 151065
A solution should be included in a future hotfix or release of GPOADmin.
The GPOADmin 5.14 Known issues can be verify on the following link.
Link: https://support.quest.com/es-es/technical-documents/gpoadmin/5.14/release-notes/2#TOPIC-1391682