Subscription User Count not Updating After Dropping Subscription

I followed the setup guide and created a "test" subscription and a "testuser". In Membership -> Edit Members. I dropped the subscription for that member. However, in Membership -> Edit Subscriptions, there is still a user listed in that "test" subscription even though in the "Edit Members" section, there is no subscription attached to that user. Why does the database not update itself after dropping a subscription?