With that mapping it seems like d-pad down is start.. and square button is down..
EDIT - My fault, it works really well, I had my offset set to -90. Looks like something is up with the analg stick causing the buttons to fire, especially when holding the stick down/left if you have the ball.. I shrank the size of the analog control, but it didn't help.. I'm just using d-pad, and it appears to be working perfectly that way.
THanks for the help! I learned quite a bit just looking at your mapping..