Getting an odd E014 error code on the dropdown button

[JustinEdse]

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I am using this bootstrap design on a web page I'm currently designing and have noticed the following issue. After selection of an item from the drop down the arrow is supposed to turn from a carrot to an X. Instead of turning into an X I see some kind of an error code:

E0 14

This has even happened when copying and pasting the HTML from the demo page. The CSS and JS files required were also directly copied and the problem still occurred. I'm not quite sure what is causing this, if it's an error in the javascript or CSS. I have test this in Firefox 24 and 29. In Chrome the E014 turns into a square instead of an error code,still not the X though. Is anyone else seeing this problem or am I missing some kind of a dependency. Can someone re-produce this?