OK even after allowing for IE8 resizing it looks like there is an issue on IE.
To debug, two strands might be worthwhile :
make a very simple page with just some text and a simple image, and see if you get the same issue
you have a lot of javascript in your troublesome page – including functions called something like startIeFix()and endIeFix() ; would it be an idea to comment out all the script elements – or disable javascript in your IE – and retest the page, to see if the problem is originating with the javascript ? If it is, you could try putting th escript elements back one at a time, to see which is causing the issue …