Slider won't repeat second time

Hi, hopefully there's an easy fix for this issue.
url: http://tinyurl.com/nwc7aoa

I have three pdf images in this slider. You can click through and everything is fine until you get to the last one and click the next arrow to see the slides again. It will show blank pages three time. Then, once you get to the last slide (blank) and click the arrow to see the slides again, the image appears.
So, in other words, it shows the slide on 1st view, it hides the slides on 2nd view, it shows the slides on 3rd view, it hides the slides on the 4th and on and on .
I've already had contacted the developer of the pdf plugin I am using, and he says that it's not a problem with his plugin; he mentioned something about "slider script".
Is there anything that can be done?