Parking sensors problem

[passat123]

Just backed out for work as usual on a week day and the OEM RVC shows up on the RNS510 fine but the parking distance display is not visible, I reset the RNS510 and it had no effect, even when I press the park distance button next to the gear selector the park distance doesn't show.

The pics are when the car is in P, same display when in N and D. R just opens the camera.

Please see the pics, any ideas???