Twice today I've had the same problem; I've killed all the mob, however the level did not end. This was in the early stages (between 5-10), and the mob was basic, not disappearing mob (Goku etc). I spent a fair amount of time walking about looking before re-logging. I have not experienced this until today.
Doesn't happen too often, but it does happen (although i've never experienced it.) The next time this issue occurs, take a video of exploring the room and send in a ticket, and we will roll back your entry.
Thank you NineArts for the reply. I will try and figure out how to take video capture of me looking around. Although, it did stop me from doing/risking a 3rd run, I do not need the dungeon entrance number. I was more curious if others experienced the same.. ^^
Windows 10 makes it so easy to record screen: - click 'Windows' key + 'G' - check 'Yes, this is a game' - click the red circle (record icon).