Membership 2 Pro Manual Update Subscription status problem

I am having issues manually updating subscriptions for those that have mailed in checks that have memberships that have expired.

It shows certain members status as “Pending (activate on next payment)” and when I change to “Active” and save it, the membership status goes back to “Pending (activate on next payment)” and will not update the membership so they can log into protected members only areas of the site.