I don't know if they are seeing the same pictures you attached above, but I can clearly see what you're talking about. I would say "no", that's not "normal".
We had some "waviness" in our Jay Flight, but nothing like what you have. Especially if the entire wall is misshapen inside and out, I would say that could be a problem, and it could cause future problems.
Good news is it should be a RELATIVELY easy fix. It is a short section of wall, and it's "stick and tin".
ALJO is right I think; it could be as simple as warped wall studs. But then the bottom of that wall might be detatched from the floor. That would be a HUGE problem. Again, relatively easy to fix I would think, but it DOES need to be fixed.
-2018 Greyhawk 29MV
-1997 Jeep Wrangler YJ (Toad)
-2015 Jeep Grand Cherokee Limited (Soon to be Toad)
-2014 Jay Flight 28BHBE & Ram 2500 6.4L CC 4x4 (sold)