Or an old one broke.
Edit: In thinking about what quests Harny is involved in, the third option, an existing quest became expliotable with the changes made to his surroundings in a recent release of the game. I think the quest I'm thinking of can be done multiple times, but I didn't think the pay out was that high to be used as an exploit even with it being able to complete it so easily. I guess if someone was really bored enough they could do that over and over again for the reward each time and after awhile they could amass a small fortune. *shrugs*