I've used this paper (gloss, matt and semi) without problem.
The only thing I can think of is :what is your humidity? Could high humidity make the paper swell slightly you think?
right now (here at my place) the humidity is low. Just checked several prints (all Agfa paper, all 3 types of finishes) and everything looks good. I can see the texture of the matt and semi matt, but over the whole print, not just the highlights.
I would guess either a poor batch, high humidity, or... I was going to say lack of washing, but I doubt that texture would be the result.