Unable to invert Y axis with joystick

[Thromordyn]

I am using the Thrustmaster T-Flight Hotas X Flight Stick. The switch on the front is set to PS3 mode.

None of the button numbers in Custom Layout are correct, but I can deal with that. Once airborne, it doesn't matter what they're called, as long as they all do the right thing.

The problem I'm having is that it is not possible to invert the Y axis to enable the correct pitch control. On or Off, for both aileron and camera, do absolutely nothing to any axis. No controls are influenced by either setting.