Hi, would I be right in saying that your site is a template monster template?
Their templates do appear to have a few issues, of which this may be one.
Take a look in catalog\includes\templates\yourtemplate\templates\tpl_product_info_display.php and see if the following block exists. (I can see the place markers in the source code but that doesn't gaurantee their is anything between them)
PHP Code:
<!--bof Additional Product Images -->
<?php
/**
* display the products additional images
*/
require($template->get_template_dir('/tpl_modules_additional_images.php',DIR_WS_TEMPLATE, $current_page_base,'templates'). '/tpl_modules_additional_images.php'); ?>
<!--eof Additional Product Images -->
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