Ok I am assuming that when I click on a product in the products listing page that it takes me to the products details page. I have edited the products details page in admin at CMS > Products > Products Details Page. Adjusted the items and widths etc. However, these changes do not show on the site.
 
Store is a former 3.2 upgraded to 3.6. Wouldn't be the first issue I have seen making this jump. Any help would be greatly appreciated.

Turned out to be just that a problem upgrading from 3.2 to 3.6. I did a complete reinstall of 3.6 and things work fine without conflicts. Of course I get to rebuild all of my customizations. An improved upgrade path would be nice.