Thanks for the heads up. I checked our vents and although I didn't see any out of alignment as you found, I did see plenty of gap for air to leak into the attic through. I will foil taping around the seam to stop the extra attic cooling. Even Duct tape would do the trick.
2012 GMC 3500 Duramax Crew Cab, SuperGlide 20k
2014 Cedar Creek 36B4, LP Onan, Level-Up, Trail-Air pin, electric fridge