Why do you allow commercials which can monopolise several cores - like PrizesWorld ?

Never seen that ad myself. Of course, not al ads shown worldwide will show for me and Adsense doesn't present me with a list of ads it shows to visitors (which would probably be a privacy violation). When I search for prizesworld in the ad review center nothing is found so I can't block it that way. If possible send me a screenshot and the url it links to.