I tried on it again and it still bothers me. I cannot believe that no one else felt the back seams. Now that I think about it, I had another pair of pants with back seams and I feel that one too. The difference is that the other pair is a loose fit so I only feel it occasionally.
The seams look good and I doubt it is quality issue. I think it is just one of those odd sensory issues. I have decided to return it.
I also ordered the Kut one and it has not arrived yet. Maybe that one will be better for me.
Thanks all for chiming in.