Hello, to my mind wrong variables used in yml_product.tpl.php
I propose to replace global variables

echo variable_get('site_name', 'Drupal');echo variable_get('site_name', 'Drupal');

to more specific and store-oriented (see store configuration - admin/store/settings/store/edit/contact)

echo variable_get('uc_store_name', 'Drupal');
echo variable_get('uc_store_owner', 'Drupal');