There have been some reports that activities will show the last action as "Created by..." under activity history, but there is no pending activity to take an action on. This isue did not affect just departure notices, but any activity that can be created and responded to very quickly (e.g. NOA, CCN-Reply, CAR-Reply).
This is an error with the order in which the actions on the activity history are displayed. If you click "View All" for the activity, you will see it was actually submitted to the other state.
Appriss has identified the issue that was cuaisng this, and while they can't correct the activities that were already affected, it should not be a problem with activities going forward.