Hello,
The theme contains a meta tag (meta http-equiv=”X-UA-Compatible” content=”IE=edge”) that instructs IE to use the highest mode available.
IE will not always comply however, and in some cases (especially on intranet sites and depending on your IE settings) IE may decide to use a compatibility mode regardless.
Depending on your situation, you may need to check your IE settings and/or server settings.
Answers for this question on stackoverflow offer a lot of information that you may find useful: http://stackoverflow.com/questions/6156639/x-ua-compatible-is-set-to-ie-edge-but-it-still-doesnt-stop-compatibility-mode
