Ours was upside down when we took delivery so the dealer sent us a new screen, which "corrected" the issue. It never occurred to us or the dealer that it could've just been set up wrong.
I've also accidentally mirrored the image one time (so that images on your left side actually looked like they are on your right in the camera). The way to fix that is, when the camera is on, to hold the Power button for five seconds. Perhaps that's the same fix for this as well.
Just got back from our third camping trip of the year (and overall for our Airstream) a few hours ago. Love it!