I am on an iphone right now and there is nothing like this at all. Try taping the gray "up arrow" to collapse the ads up to the top. It looks like you have expanded the ad block down over the content.Now im on my desktop.... On mobile the ad system is filling the screen up with adds that dont scroll away... You can some times get about one 4th of screen to scroll topics and read posts... But dont ever think about writing a post. The keyboard fills up that space and the ad doesnt even disappear or scroll away.
by cached i mean what ever the add service is deemed adverts for me today maybe based off analyticsWouldnt that be a cache in your local browser?
If the ad is out of 'rotation' and you are still seeing it.. perhaps local then?
(I rarely visit on my phone unfortunately)