Slider shows image double on page

I have recently installed and setup this plugin and tried it on a page. However, it shows the images in the slider twice, but makes use of 1 slider.

Example Website

This is what the last bit of code on my page looks like:
<h4>Foto's</h4>
<pre>[metaslider id="247"]</pre>
<a title="Muziek" href="http://dirkvanerve.com/muziek/">< Terug naar Muziek</a>

http://wordpress.org/plugins/ml-slider/