Hi there,
Looks like a cache problem, I keep on changing the max-width to 1200px

But in chrome, it shows 1200px

Based on the selectors, seems like it displays different header bar?
Adding this CSS should work too, but not taking effect in IE too
.e3516-1.x-bar-content, .e3516-19.x-bar-content, .e3516-37.x-bar-content, .e3516-53.x-bar-content {
max-width: 75% !important;
}
The problem in IE is the max-width, setting it to 80% fixes it. I duplicate the footer and it still picking up the settings from the original footer. I’ll continue checking, the cache is a common cause of headaches in IE 
Thanks!