I've just checked this (on my computer and my smartphone) and I'm not experiencing this problem. Though you say it's not a big issue, I'm a bit curious: are you able to log out?
I just refresh the page, or open another tab, or just close off the browser and I logout. I was in Chorme and it's only that one ad (so far) that covered the box. So that's why it's not a big problem lol. But just to document it and yours is running fine so that good.