I got an error with slide-in plugin when try to close

Hello,

I got an error with slide-in plugin when try to close slide. Searched in forum and found a few topic with relevant issue.

Slide showing twice
On Slide In, the 'x' button isn't working to allow users
Slide in x button not working.

Then I decided to check this issue and found reason.
Screenshot: http://cl.ly/image/1d2Q3w0u2v34
This plugin generates once html output but jQuery selector count it twice.
and this part of plugin

$('.wdsi-slide').on('click', '.wdsi-slide-close a', function(e){
		e.preventDefault();
		var obj = $(this).closest('.wdsi-slide');

		slidein_hide(obj, 0, true);

		register_seen_uri();
	});

only close one element that selected by jQuery.

This is really weird, a developer who good at js may help.

WordPress version: 4.1
jQuery version: 1.11.1

Thanks.