[Nutbutt]

They look more like fold marks that form for verts. They are brought out more if the top is dirty. Try washing and using a very soft ( horse hair) type brush.
I am not saying this is common, I have been through the top replacement issue (4 times). With a top Treatment and washing with a light brush my top now is looking really good. It's been a little more than four months since my total top replacement and things look really good.