IE8 and IE7 unordered/numbered list grief

If I use CKEditor to add an unordered or numbered list - in IE8 and IE7 it will shunt my sidebar to the bottom of the page under the content.
If I use CKEditor to add an unordered or numbered list with a font-size increase, in IE8 and IE7 it re-sizes all list-items in the sidebar and a paragraph I have in the footer. Any copy-containing elements after the unordered/numbered list that isn't content - in other words.

Does IE think CKEditor ul/ol/li styles should be applied to all subsequent page elements?

It would be a shame to have to turn off unordered or numbered list because of this.
Looks fine with no unordered or numbered lists.
Looks fine in Firefox, Chrome, Safari, Opera, IE9