[Plugin: Digg Digg] Ajax: Scrolling back up causes the post image to misalign down

See the issue here http://brijux.com/2010/05/05/current-library-system-is-very-inefficient/

Plugin works great except when I scroll back up, posts with images are mis-aligned and they are shifted down. There is no issue on posts without images.

I have made a video of this in case my site layout is changed. http://www.youtube.com/watch?v=MBURHwN3VbI

Here is my code
— Initial Position —

.dd_ajax_float{
	background:none repeat scroll 0 0 #FFFFFF;
	border:1px solid #DDDDDD;
	float:left;
	margin-left:-95px;
	margin-right:10px;
	margin-top:0px;
	position:absolute;
	z-index:1;
}

— Scrolling Position —

$j=jQuery.noConflict();

$j(document).ready(function($) {

	//put content div class, when scroll beyond this y, float it
	var $postShare = $('.dd_ajax_float');

	if($('.dd_content_wrap').length > 0){

		var descripY = parseInt($('.dd_content_wrap').offset().top) - 20;
		var pullX = $postShare.css('margin-left');

		$(window).scroll(function () { 

			var scrollY = $(window).scrollTop();
			var fixedShare = $postShare.css('position') == 'fixed';

			//make sure .post_share exists
			if($('.dd_ajax_float').length > 0){

				if ( scrollY > descripY && !fixedShare ) {
					$postShare.stop().css({
						position: 'fixed',
						left: '50%',
						top: 20,
						marginLeft: -560

					});
				} else if ( scrollY < descripY && fixedShare ) {
					$postShare.css({
						position: 'relative',
						left: 0,
						top: 0,
						marginLeft: pullX
					});
				}

			}

		});
	}

});

http://wordpress.org/extend/plugins/digg-digg/