sh:forEach insert item at wrong position

<zk xmlns:x="xhtml" xmlns:sh="shadow">
	<zscript><![CDATA[
		ListModelList model = new ListModelList();
		model.add("1");
		model.add("2");
		model.add("3");
		model.add("4");
	]]></zscript>
	<div id="bind" apply="org.zkoss.bind.BindComposer" >
		<button label="insert" onClick='model.add(2, "2.5");'/>
		<sh:forEach items="@load(model)" var="item">
			<div>
				<label value="@init(item)"/>
			</div>
		</sh:forEach>
	</div>
</zk>