I think there's actually a DESIGN for this - as a flat fridge might have the doors opening way too often while traveling, or even if the coach wasn't exactly flat and level when parked... a slight lean back, like ours, is perfectly fine... it almost helps to make sure the door closing, on it's own.
'14 Thor Palazzo 33.3 compact diesel 100k+miles since '14... US, Alaska, Canada...
AND a '14 Gulfstream Amerlite
AND a '07 ForestRIver Rockwood