Some filters get updated with the Delta Update (default of every 5 minutes). Some filter get updated with the NS.Daily scheduled task. And some only get updated when the use click the "Update Membership" button.
What is the difference?
The Delta Resource Membership update schedule will only touch filters that are associated to an active filter via a "Target’.
The Complete Resource Membership schedule will update filters that are associated to policies that are both enabled and disabled.
Some filters have no associations to anything. They are not associated with any update schedules.