MovieClipLoader: bytesTotal wrong?

Hi all,

I have an one frame swf containing the following code:

var loader_mcl:MovieClipLoader = new MovieClipLoader();
var listener:Object = new Object();

listener.onLoadProgress = function(target:MovieClip, bytesLoaded:Number, bytesTotal:Number) {
	total_txt.text = bytesTotal;
	loaded_txt.text = bytesLoaded;

loader_mcl.loadClip("img/full/bozzini_maandflyers.jpg?rndm="  + Math.random(), holder_mc);

You can see the swf in action here

As you can see, the bytesLoaded never match up with the bytesTotal.

Does anyone have a clue what this might be, or maybe experienced the same thing before? (server side issues?)