Your batch may have restored itself because not all of the shipments in the batch were created at one time therefore leaving the remaining shipment(s) open.
Anytime you list a batch using the private workflow, we must refresh the batch status as Amazon requires due to the warehouse rotation that occurs every 48 hours. When this happens, new shipments for the entire batch will get created.
If this happens, any shipments created will need to be deleted to comply with Amazon's Shipping Policy. You will then need to create the new shipments.
To avoid this in the future, create all of your shipments right away.