That Product Description that is displayed in the order comes from the cart. When the cart is populated it takes the modelref with it and creates the description. If after the product/model details change the product description in the cart and order will not.
Maybe when you created the product/model and added it to the cart the ref was not included at the time? Try adding it again..making sure the modelref is on the product which you add to the cart.
This code hasn;t changed since the begining of version2 so I'm surprised if it doesn't work!!
The only other explaination I can think of could be that you've updated the order tempates to use the another detail template...the "detailrows.template".
Regards,
Dave.