On the Royal SX (and PTX) when an alarm condition is triggered the screen then switches to that display. So it looks like you have an alarm condition triggered on a sensor which then takes precedence on the screen.
So for instance say you had a voltage sensor on a Lipo that was set to alarm at a low voltage and the lipo sagged to this voltage at max throttle then every time you used full throttle the alarm would be triggered and the screen switch to that display.