2 for aileron, ONE for elevator, ONE for rudder.

Ailerons would go on a Y cable. Just like it sounds, cable looks like a Y. Plug each aileron servo lead into the short legs of the Y, the long leg goes to your rx.

On most systems, other then JR/Spektrum, ailerons go to #1 slot on the rx, elevator to #2, motor/esc to #3, and rudder to #4.

Almost sounds like you have the rudder plugged into the aileron channel.The ailerons and elevator are on the same stick, rudder and throttle on the opposite one.