The white pieces on the switches are supposed to be there. The diamond shaped hole is correct, as is the smaller actuator. You're in good shape, all you need to do is adjust your leafswitches.
Very gently, with your fingers or a set of needlenose pliers, bend the outter leaves away from the hole. Bend them gently, a little bit at a time. They should all end up the same distance from the hole, just far enough that you can't quite close two switches at once. (You can adjust them further if you want your stick to be a little less sensitive, but start there.)