Extra div code generated?

This code is generated:

<div class="res-sidebar">
<section class="attachment_holder widget_document_attachments"><h3>Document attachments</h3><ul class="attachment"><li class="pdf"><a title="Download the Changing the PDF name that is long and longer" href="http://localhost:8888/wordpress/wp-content/uploads/2013/05/back.pdf">Changing the PDF name that is long and longer</a><span class="filesize"> </span><br /></li><li class="pdf"><a title="Download the This is an example of a PDF name" href="http://localhost:8888/wordpress/wp-content/uploads/2013/05/front.pdf">This is an example of a PDF name</a><span class="filesize"> </span><br /></li></ul></section></div>              </div>
			 </div>

It’s added an extra </div> which is screwing my layout.

http://ww.wp.xz.cn/extend/plugins/document-attachment-widget/