This is my opinion but hopefully, it will help the admin team track this down.
I downloaded an app on iOS called httpwatch. This will allow you to browse a site and it will record what is happening in the backend.
Based off of the information gathered from that tool, the current popups are caused by the ads in the bottom right-hand corner of the site on mobile, you can only see it on an iPhone if you flip your phone landscape, but it still loads in portrait the responsiveness just hides it.
Once it loads long enough and gets to the point where for example on the Oculus Rift ad, the doors in the ad open and the screen changes from red to Blue it throws the Google User You Win bullshiz everytime. OR for that matter, if you click on the ad at any time for any of the ads it does go to oculus.com/rift or the other sites the ad may be for, for a second but then redirects to the Google User Win BS.
I do not think this is Scubaboard doing this on purpose, it is though in my opinion a problem with one of the adserve networks being used, specifically (as far as I can tell) on mobile.
In fact, the bigger problem seems to be with ads specifically Javascript ads that are served through u9zw.com. The ads that originate through that domain serve Javascript errors in console, redirects and just plain odd behavior all around.
The url that seems to be pissing the site off is
https://u9zw.com/vavsdtf which you can't load directly through a browser but it and other randomly called url's from the same domain u9zw.com get called A LOT as they are part of the adserve network being used.
Another example that does load is something like this meant for the left hand ad column
https://u9zw.com/uuimage/jstory/jst160.jpg
I can't repeat this on my desktop to use better debug tools because that particular ad never loads up. Seems like it is mobile only and the two are using different adserve networks.
httpwatch does allow me to save a log that may help the admin team troubleshoot further. Please let me know if you would like me to send it along.
@Diver0001