I have several pairs, but they are anywhere between 2 and 5 years old. The picture is kind of hard to see, but it looks like lines are there, for sure. My shorts do not have that.
Call Terry and describe what you see, and maybe send a picture. Their customer service is like TE's... they are great and listen well. They once sent me half of my order and half of someone else's. It took awhile to figure out who had the rest of my stuff, but they were very responsive and apologetic.