Just to double check, is your IE browser mode and document mode set to IE9? when you open IE simply press F12, it will pop up an IE developer tool. Altough you are using IE9, but the output of document could be Quirks mode or IE7 mode.
If you have IE mode problem, you can force a web page compatibility to specific document mode. e.g.
<meta content='IE=EmulateIE8' http-equiv='X-UA-Compatible'/>
so that you fix the issue on IE8 will do.