You get too zoom around/outside the dungeon. Like there's a black vacuum around the dungeon in which the camera circles around in. That's my guess.
But honestly... I'd actually just prefer a old, worn map. I've mentioned that before.
I'm not really into this "google maps"-like system. I find a simple map, one that you can actually imagine holding in your hands, more "immersive" and "RPG"-ish than what we've been told so far about Skyrim's "map" system. This goes for the exterior map and dungeon map and so on. Generally, I find a an old, worn map more fitting for Skyrim than this "google maps"-like system.
Sometimes simple is better.