Controller shoulder buttons firing both at the same time.

GIF showing the problem: https://twitter.com/fusedotcore/status/1005536435825463296

I've got most of my controls set up, and while testing I noticed that both the L and R shoulder buttons on my controller are firing each other. In this case they are "joystick button 4" and "joystick button 5". I press L1, both joystick buttons fire. I press R1, both joystick buttons fire.

I tested this on another PC and it happens there as well. It's not my project, I tried a fresh with just the Controller tester asset, still happens.

The windows controller properties window which shows what buttons are down shows them being different buttons and the dual firing not happening.

Anyone know what is going wrong?