Why wont the trigger buttons on my gamepad trigger the listener

I added a RawInputListener every button on the gamepad triggers the listener except the two trigger buttons. All the other buttons including both of the bumper buttons trigger it. Any ideas on what the problem might be?

onJoyButtonEvent(evt: JoyButtonEvent) {
println(evt)
}

A gamepad trigger is more analog than digital. Use OnJoyAxisEvent to listen to them.