I assume you're using X-Plane 10. X-Plane may read each state of the switch as "held" inputs--if you flip the switch watch if a box has a green check mark that never goes away in the Buttons: Adv screen. You'll need to set the two states to on and off commands. There may not be both for every option. Ex: Igniters/Igniter #1 has both an on & off option, so it could be set to the switch state up and down respectively. Assigning GPS/G-430 Nav-1 chapter dn on the other hand would be like constantly holding the chapter button on the device.