Yep, that's what I see too.
Hmmmm.....this makes me think eBay may still be playing around with alternative page designs and the IFRAME on other than the main site.
Where exactly is/was the "gap", i.e. what's just above and below? If it's above the gray horizontal line, that should be part of the IFRAME.
Anyone else seeing the right-side vertical blue border-line break and pushed right from the store banner down? If so, which browser and monitor res are you using?
Danno