MtGox has market orders and non-market orders. From what I know, market orders will execute at the current market price whereas the non-market order will execute only at the price that I have set (or a better price).
I have set a non-market order to sell my coins at $183.44/BTC. However, when I look at my logs, the coins were sold for $181.11002.
I've tried to approach MtGox staff but they are simply beating about the bush. Can someone explain why were the coins sold for a price lower than the price set?