It's not the ad server we use DoubleClick it's these hosters I think one of them off the top of my head is OwnerIQ. What my thinking is, and just by looking at some of their specs, is that they have some legacy stuff and there is some sort of issue there. I wouldn't call the situation typical, in fact very rare, but I thought it would be worth a shot to ask.
I use GSAP for all my HTML5 stuff because it's so conducive to the vanilla JavaScript I write for banners.
Thanks Carl huge thumbs up for the reply.