Admins with permission to mange Filter Subscriptions cannot view Groups subscribed to a Filter Subscription by any account other than their own.
If an account subscribes a group to a subscription, only they can view, edit, remove this subscription.
I've checked through Settings -> System -> Filters and Filters -> <Filter_Name>-> Manage Subscriptions. Is there somewhere else I should be checking, or is this the current State of Jira?