Its to do with the javascript, obviously on the page you are hitting its trying to load some javascript but that javascript is not compatible with IE9, this is an issue with the site, not your computer.

All you can do is let them know of it and if it really bugs you that much you can switch javascript off in your browser, there are loads of instructions on how to do it all over the internet, the only issue you may get with this is that some bad practice developers of websites do not account for those that have javascript switched off and you may come across quite a few websites where they look really bad because their scroller or something is not working.. this can also affect a websites navigation, if its based on javascript, those pages would no longer be accessible to those with javascript switched off

so really there is good and bad with switching it off

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