I'm guessing its because on your profile, you said you are male. If neither male or female was selected, then it probably shows the '?' EDIT: Go to the top of your window and click the little dropdown arrow next to your user name (or just hover your cursor over the arrow). Select "personal details" and you will see the Male, Female, and Unspecified radio buttons. If you change it to unspecified then your's should change to the '?'.
