I was just inside one of the barrows, thinking I cleared it, collecting loot on the upperfloor when I started hearing footsteps. The game doesnt have the best surround sound so I couldnt tell if it was on my floor or the one below me. I started searching on the upper floors, and when I got close to the stairs down, a red dot on the compass appeared for an instant then disappeared. The footstep suddenly disappeared too. I looked everywhere and I gave up the search. I went outside and looked at the map and it said the dungeon was clear. WTF

I've heard someone using the alchemy table when no one was there. Don't know about red dots, but two wolves' dots vanished tonight...well, one went in the river. Don't think things generally drown, so I figured he despawned.

Of course, I've been seeing things spawn, too...soldiers and a prisoner. They emerged from the road in front of me. Immersion, killed.

Maybe just one of those weird glitchy things?