Only one hand ever gets button inputs from the motion controllers. Easy way to recreate is use VR template. Add event for “Motion Controller (L) Facebutton1” and “Montion Controller (R) Facebutton1” in event graph of the BP_MotionController. Then open debugger while running. Select the Left instance in debbuger and press buttons. None will work. Select right touch instance in debbuger and you will get both events.