Broken design in Internet Explorer 11

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AskBot has broken design on IE 11.

• here how askbot.org/en/questions/ looks like:

  

Same thing on my page. Maybe the reason is the multiple css data files.

Update:

The Problem is the font family, i.e.:

 font-family: 'Open Sans Condensed', Arial, sans-serif;

Open Sans Condensed is not recognized. So we see Arial instead, which is wider.

I also see two different Open Sans Condensed fonts calls in the askbot code:

<link href='//fonts.googleapis.com/css?family=Open+Sans+Condensed:700&amp;subset=latin-ext' rel='stylesheet' type='text/css'>

and

<link href='//fonts.googleapis.com/css?family=Open+Sans+Condensed:700&amp;subset=cyrillic-ext' rel='stylesheet' type='text/css'>

According to Google it can be combined to:

<link href='http://fonts.googleapis.com/css?family=Open+Sans+Condensed:700&subset=latin,latin-ext,cyrillic' rel='stylesheet' type='text/css'>