Genericons not displaying in iOS

I’m running a custom child theme using Hoffman as the parent. Whenever I access my site, quiethabits.net, on an iOS device (tested on iPhone 6 and iPad Air) none of the genericons show up. There are 4 social links at the bottom of the page as well as an icon in the search box. They show up fine in Chrome and Safari on Mac and show up in Chrome when I switch to the mobile view in developer mode. Any ideas of what could be going on? I’ve been scouring every line of code and I can’t find anything that would be messing with the display on mobile devices.