Hey GoIrish, we need a little more info. Do you have the servos on a Y-harness or are they plugged into seperate channels of the Rx. If it's the second option, which channels? Are the servo's orientated the same (output shafts both towards the trailing edge of the wing or both to the leading edge?) If they are not the same, that's the problem.

EDIT// slow reader today, I just saw where you say it's on a Y-harness. Look at my last statement then.

Another possability is you have a reversing Y-harness. Take a picture of it and post it if the servo orientation checks out.