I checked your site as well as the demo site and everything looks and functions great on IE11 + Windows 8.1 desktop version. The metro version (probably a scaled down version of IE11) struggles a bit with parallax animation but I do not see any examples of backgrounds not spanning full width as seen the screenshots you sent. Do let me know if you still see examples of this issue happening on desktop version of IE11 and pls specify how I can reproduce it. Sorry – this took some time since I had to have Windows 8.1 installed on my Mac OS X but hope I am better prepared now to tackle your future IE queries 🙂 Thanks.