Node Checkout causes down payment to be lost

I have ubercart, uc_downpayment and node_checkout installed on a test site. I'm selling event registrations where someone would put a deposit down and then pay by a certain the balance. (This module is perfect for this purpose). When they go to add to cart, there is a node checkout form that is in the process whereby they enter the registrant information. So, instead of going from clicking add to cart directly to the cart, we have an intermediate screen for entering the registrant's name and other pertinent information. The problem is that if that intermediate step is taken, the down payment is lost and the full amount shows in the cart.

Steps to Recreate
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1. as anonymous user, click on product
2. select down payment (not paid in full)
3. click to add event to cart
4. enter registrant information into in-between page
5. Click continue button

What I experienced
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Full amount of product is in cart

What I expected
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Down payment would be in cart

I believe this may have something to do with the fact that we don't go directly to shopping cart page and, instead, stop at form for entering other information.