Why is the uc_product_adjustments table being used instead of the uc_product_attributes in lin 65 and others

$product_attributes = db_fetch_object( db_query("SELECT COUNT(nid) as count FROM {uc_product_adjustments} WHERE nid = %d", $form['nid']['#value']));

maybe you could also provide insight to why my uc_product_adjustments table is empty?