GPS and camera in permanent night mode

About three weeks ago, I noticed that the GPS display had changed to night mode. I don't remember touching any levers or buttons but there it was in purples and blues (as seen in the pic - it used to be in colour). The reversing camera had also gone into night/negative mode meaning any lights behind me are showing up as black. Subsequently, as I am driving the map disappears and is replaced by an analogue clock and, when that appears, the stereo becomes very loud. Yesterday, when I reversed the camera view was almost whited out.


Any ideas of how to revert this to normal? I have been through the settings but there is no day/night mode that I can find and most of the buttons when pushed say they are not active.

All suggestions are gratefully received.