horizontal scrollbars in chrome do not work as expected


I’m having a strange issue with the horizontal scrollbar of dhtmlxgantt and chrome. It keeps sliding to the right.
This issue does not happen with mozilla.
i’m replicating the example posted here, but adding a wider timescale with start_date and end_date config properties.
the version i’m using is the one at your download site dhtmlxGantt v.2.0 build 130904.

I CAN move the scrollbar to the the left or to the top right, but when moved in between, it slides to the left

<!DOCTYPE html>
	<meta http-equiv="Content-type" content="text/html; charset=utf-8">
	<title>Define date range</title>
<script src="components/js/gantt/codebase/dhtmlxgantt.js" type="text/javascript" charset="utf-8"></script>
<link rel="stylesheet" href="components/js/gantt/codebase/skins/dhtmlxgantt_meadow.css" type="text/css" media="screen" title="no title" charset="utf-8">
<script type="text/javascript" src="testdata.js"></script>
<style type="text/css">
	html, body { height: 100%; padding:0px; margin:0px; overflow: hidden; }
<div id="gantt_here" style='width:1000px; height:100%;'></div>
<script type="text/javascript">
 gantt.config.start_date = new Date(2012, 01, 01);
        gantt.config.end_date = new Date(2018, 01, 01);
	gantt.config.scale_unit = "month";
	gantt.config.step = 3;
	gantt.config.date_scale = "%M";
	gantt.config.min_column_width = 50;
	gantt.config.scale_height = 90;