For some reason, my div of id "home" (landing image/screen) disappears on just iPhones when I run responsive test. Other mobile devices were fine, it's a PNG file so I'm not sure what is going on.
It's probably a simple CSS issue but nothing so far I've tried is working
It's not the div that's disappearing, it's the background going white, and you can't see the logo because it's white-on-white.
background-attachment: fixed doesn't play nice with mobile (google it, e.g. Fixed background image with ios7). If you remove that property, you can see the div, background and logo.