I can say this unequivocally, we have no pop-ups on PPRuNe.
You have a hijacker on your browser. They initiate pop-ups on random websites, making you think they were started by a site, which never had a pop-up to begin with.
Search for 'Browser Hijacking' in this forum, and you should find some usefull information on how to rid yourself of it.
Ridley