Why do two images pop up with Fancybox 1.3.4?

Why do two images pop up with Fancybox 1.3.4?

I am working on a section for a client that has two images displaying in
the Fancybox 1.3.4 display here:
http://corecubed.com/portfolio/project/atlanta-home-care-partners-alzheimers-whisperer174-brochure
When you click on the image, it pops to not just one image but two and
they have different appearances as well. The topmost image has a different
close button and also has the option to enlarge to full screen.
I didn't build this so I am not exactly sure what is happening here and
could use some help to trouble shoot it.
Here is the html:
<div class="featured featured1">
<a class="preloading"
href="http://corecubed.com/images/uploads/AHCP_AlzWhisperer_Broc_Portfolio_XL.jpg"><img
src="http://corecubed.com/images/uploads/AHCP_AlzWhisperer_Broc_Portfolio_Medium.jpg"
alt="" /></a>
</div><!-- end .featured -->
Here is the jQuery for that part:
jQuery(".preloading").fancybox({
'showTitle' : false,
'transitionIn' : 'fade',
'transitionOut' : 'fade',
'scrolling' : 'no'
});
Any help in resolving this will be greatly appreciated.
Thanks.