Switch between PEMGATE and DUMMMYGATE based plans has been performed, but subscription was not deleted on OA side. Expected behaviour is that if resources are no longer in the target plan, they should be disconnected. If a subscription is moved from PEMGATE to DUMMYGATE, the OA subscription should be removed.
Switch between plans based on different gates shall not be possible. The thing that possibility to configure such upgrade path exists is a bug with id #PBA-49596.
You may remove the subscriptions with OA API pem.removeSubscription. Te upgrade path is to be corrected to avoid an issue from reoccurrence.