Games acting different in GS to iphone

Hello
My Game 'War Plastic' on the app store, i'm currently developing further levels
but i'm finding characters perform correctly in gamesalad, but when i publish these
for testing on my iphone, the characters(not all) peform differently and shoot off
the screen, when on gamesalad, theyve acted like they should have done ????
puzzling the hell outta me
any ideas ????
mark
My Game 'War Plastic' on the app store, i'm currently developing further levels
but i'm finding characters perform correctly in gamesalad, but when i publish these
for testing on my iphone, the characters(not all) peform differently and shoot off
the screen, when on gamesalad, theyve acted like they should have done ????
puzzling the hell outta me
any ideas ????
mark