Cordobo Green Park 2 theme breaking in everything but Mac/Safari.. please help!

so i built everything on a mac in safari and the site looks great (other than a few annoyances that I cannot figure out) but when i loaded up the site on windows IE and firefox, as well as fireox mac, the header image does not appear! it’s driving me crazy and to be honest i’m not sure where to even look.. the site is https://www.droiddoesgames.com