Joomla custom template - left module content issues

Hi first off let me apologise for all the validation errors on my website, shocking indeed! but I'll get there in the end. Validating for a CMS seems to be a whole other level.

In IE my left column module seems to want to expand and shifts the content in the main body area down. It does it's slightly in FF but to a much lesser extent.

Please could someone give me some pointers?

thanks

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