On iPhone, Page Does Not Reach Edge of Screen

Hey all, I’m working from Twenty Twelve and I’m having a weird margin issue. When I load the site (dotwiki.org) on my iPhone, it renders a large white space to the right. My content only goes so far, and then it’s just white.

Resizing the site in my laptop browser does not recreate this effect, which is the weirdest part for me. There’s no horizontal scroll either. The page is truly full-width when I’m not on my iPhone.

I’ve made both body and html width: 100% I’ve set overflow-x: 0;, I’ve double-checked my <meta name="viewport" content="width=device-width"> and I’ve been on the lookout for anything that might be causing an extra margin… but I’ve come up with nothing. Help?

Please and thank you!