So, my Cleric is charging 57 rotten flesh for an emerald, but there is no reason for it, I didn't hit him at all. I just walk out of where he was and walk back in later, and BAM! It's at 57 for no conceivable reason.
Edit: I figured out what the problem is, on Clerics it seems there's a bug with their rotten flesh trade where the more you do that trade, the higher the price gets.