Similar thing happened to me couple of weeks ago. My display would act like it was in night mode all the time. It would change for an instant to normal mode when I would put the car in reverse, after a moment I would pick up the rear camera picture.
After looking at the wiring I found that the ground wire from the bypass module had come lose. I grounded the wire and have not had problem since. Look at all of the ground wires to make sure all are grounded properly.
Hope this helps