Nunchuck stick not calibrating correctly

[zombye]

(I am using the official Wii Remote and Nunchuck, that came with my Wii.)
Basically, when in game(in this case Super Mario Galaxy), Mario will always move forward or to the right depending on which way i point the stick, even if it is centered at all times from being plugged in to the Wii remote until i get in-game.

Any ideas why?