I'll post their responses here, so follow this thread if you're interested.

https://www.cougarboard.com/board/message.html?id=33083885

It seems like we've had constant problems for months with ads that don't stay in their div/iframe, or affect things outside of their div/iframe. Is there anything that can be done on my end or your end to enforce this, such as with the iframe sandbox feature? I set up a test page with the top ad sandboxed, but that top ad doesn't seem to load when I do that. It appears that there are CORS issues with the bidding.

Can you force a sandbox on whatever ad eventually loads?

https://www.cougarboard.com/test/ads.html

We can't adjust the iframes or the iframe sandbox within the ads. On our end, everything is working correctly. When you say top ad, are you referring to the header ad? Could you share a screenshot or screen recording of ads not staying in their div/iframe?

Just check all of the reports I've forwarded recently, they're all ads that aren't staying in their frame.

For reference, here are the all of the screenshots I've received this month, which I forwarded to them. I double checked to make sure there aren't any FO posts or anything like that. On a couple of them you can tell who reported the ad, but they've also been vocal on the board about misbehaving ads, so that shouldn't be a surprise.