During a Multi-User Editing session with two or more team members two or more users can take control of the same actor and move it to different locations in the viewport at the same time.
However, if those users let go or release control of that object at about the same time ( within milliseconds ), that object can show up in two or more different locations within the scene ( viewport ).
Two users try to take control of the same actor. Steps:
There are a few variations of that, but basically we have noticed potential for confusion when two users try to move the same actor at the same time.
Technically, the last user to have control of the mesh should win - but in this case there is no winner.
Network / latency lag may play a factor in this bug. Adding distance between users may help reproduce the bug. We were able to reproduce the bug by connecting from two different locations ( LA and Vancouver ).
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-195262 in the post.