Gamesir X4 Aileron always showing red light?

Got a new X4 Aileron today, but I've noticed that there's always a red light on the right thumbstick

The above photo is with both sticks set to Lighting Off. Camera is misleading, because it's actually the white light that's red and the rest is off (but glowing due to nearby light)

Changing colour will change that section a different colour. For example, solid green will have an orange section