I entered a Bull Call Spread of 215/220 of Face Book. When I entered this trade on TOS, it said my max profit is $245. However, when the stock price of Face Book got to about $221.70, I closed my position but the amount of $285 was credited to my account. I thought my max profit should only be $245? Why is there a difference between the max profit when the trade was entered compared to the actual profit received?