Products not displaying in category listing

I have published a module as a category listing of product categories. The categories are displaying. However, when I click on a category, none of the products in the category will display. The only think in the module that is displayed is the Hikashop Footer.

I can successfully publish a module with a product listing of products in a specific category, so I know that works. I don't understand why clicking on a specific category is not giving me the same results as the product listing.

Can someone enlighten me on what I'm doing wrong? I'm new to Hikashop..I had tried VM but was getting very far in the set up and Hikashop looked easier to manage. I've progressed farther with the Hikashop setup, but I want to display product categories for the user to narrow down what they want to shop for and see products within those categories.

Thanks

-- url of the page with the problem -- :www.dispatchinstitute.com
-- HikaShop version -- : 2.2.1
-- Joomla version -- : 2.5.14
-- PHP version -- : 5.3.24
-- Browser(s) name and version -- : Firefox 23.0.1 (however, Safari gives me the same results)
-- Error-message(debug-mod must be tuned on) -- : Error_message