There is the current site with Cloud Zoom disabled: http://www.oakstone.com/comprehensive-review-of-colon-and-rectal-surgery
Here is the plugin enabled: http://qa.oakstone.com/comprehensive-review-of-colon-and-rectal-surgery
The issue described comes from the fact that you have placed the SKU and share buttons (the <div class="center">) in the <div class="gallery"> element which is not correct. The Nop Cloud Zoom plugins replaces the .gallery element in order to place the gallery with the cloud zoom integrated. That is why when enabling the Nop Cloud Zoom the SKU and Share buttons are not visible.
Simply place the SKU and Share buttons outside the .gallery html element and everything will work as expected.
Hope that helps!