This is due to the error you see at the bottom of that page:
Fatal error: Out of memory (allocated 61341696) (tried to allocate 11700 bytes) in /homepages/19/d403739231/htdocs/antronix/webassist/caching/CachedResize_Image.php on line 106
This is most likely because you have uploaded a very large image for the fourth product that should be displaying on that page. Update the product with a more reasonably sized image for displaying on the web and the error should go away.
I'd just resize it with photoshop. It is probably a high definition photo that is Megabytes in size that is causing the problem.