ext-all.js loaded twice as shown in "Network" tab in IE

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I am using Ext Js 4.0. If you look at the below image capture of the Network tab in IE9, the ext-all.js is loaded twice. There is nothing in the code calling it twice. I use the below lines in the html file to call the extjs script files.

<script src="extjs/ext-all.js"></script>
<link rel="stylesheet" type="text/css" href="extjs/resources/css/ext-all.css" />

Network_Capture.jpg

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Attaching little better image for clarity.

Network_Capture.jpg

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any help?