I'm currently on my work Mac, where I don't have an ad blocker installed. I have no ads at the bottom anywhere near the "similar threads" listing, but I *do* have an ad that shows at the top of the page, and one that shows on the right side in the "sidebar" area. I thought you might just be onto something, with the idea that perhaps the ads had a glitch and weren't showing in the right place for Raj...BUT, he ALSO has ads in the "normal" spots, the same as mine.
I've not had a single "pop-up" sort of ad show up, Raj. Methinks perhaps you have some sort of malware/virus thing going on.