Incorrect value returned by ui.value in slide() function

In the code example below, if I move the slider quickly right to left, the mininal value changes to other numbers than zero. The change() function seems to work fine.

Tested in Firefox 3.0.7 and IE 7.

<script type="text/javascript" charset="utf-8">
$(function(){

$("#slider_test").slider({
	min: 0,
	max:100,
	slide: function(event, ui){
		$("#output").html(ui.value);
	},
	change: function(event, ui){
		alert(ui.value);
	}
});
});
</script>

<div style="padding: 10px;"><div id="slider_test" style="width:100px;"></div></div>

<div id="output"></div>