I've actually seen that quite a few times and I'm not too sure why that happens... hopefully someone can chime in on this and help figure it out. Not too sure if it's "normal" but it would be nice to know..
Could have just been some defect during the manufacturing process with a specific batch. Best thing to do before stepping into the dealership is finding some cars on the lot that don't have the same thing going on.
The trim on the small triangular window behind the back passenger doors of the 4 door sedans is made of a different type of plastic. Apparently, it can become malleable compared to the rest of the door trims. Not sure if the same applies for the coupe and it those ridges happened when it was heated. Still, your dealership should replace it under warranty as a defect.