Try adding the following meta tag to your page if you have not already done so:
<meta http-equiv="x-ua-compatible" content="IE=edge">
Make sure this is the first meta tag on the page.
Are you running this application on the intranet? If so, IE11 may decide to emulate an older version of IE (check this with the F12 Developer Tools). The above meta tag should stop IE from doing this and make it display the page in IE11 mode.
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