Couple of things, from a n00b.
1) There is a joystick directly in the way of your spinner.....
2) Those players 3 and 4 controls are WAAAAAY angled. Imagine you are that player, looking at the screen...with that much angle, its easy to get confused..ie: you want your character to go up, so you push up towards the screen, only the joystick is at an angle and that means your're really pusshing up/right, your character doesn't move the way you intend him to move, and you get all messed up.