The short answer is because IE is not able to display this site correctly.

The brand new Browse Happy web site will give you the long answer, explaining why Alan, Chris, David, Mike and the others have switched to a better browser. You will note that no women was asked why she had switched, and that all switchers but one have switched to firefox. Wondering why ?

Just try some of its extensions, like the web developper tools, or the mouse gestures, and you will understand quickly ...