4 player support for new super mario wII

[sugarqfx]

trying to run 4 players using 3 logitech f710 and one xbox 360 controller, one thing I've noticed is that whatever gamepad i used the controller thats configured as 4th player doesnt work, I ve got the controller config properly setup drivers, and buttonwise. when I try to run the game, the 4th player button setup up si all messed up, up button is right and down button is left while left button is down. is it the rom? or the dolphin? which is not compatible?