I wandered in to Understone Keep to sell some stuff off to the blacksmith and wizard, but a couple of the NPCs in that place started attacking me for no reason. The Thalmor guys, Jarl Igmund, as well as Igmund's housecarl and steward are all attacking me for some reason, and I can't get them to stop. None of the guards or other NPCs attack me or do anything, they just wander around doing their "omg its a fight" thing.

What do?