Weird Problem On My Signup Page in IE Only

I'm having a weird issue with the signup page on my new multisite install. The page looks fine in Chrome and Firefox, however in IE it's like the page is only being partially loaded, maybe 20% of it. You can check it out here:

I tried deactivating all of the plugins and it still does it. The rest of the site looks fine in IE, it's just the signup page.

I'm using a child theme of twenty eleven. I also reverted back to just the default twenty eleven theme...same problem. I even ran the code through an HTML validator and it returned HTML5 compliant.

Any ideas?? Thanks!