Marketpress Multisite Checkout

I've set up a multisite with marketpress and enabled global cart. As I'm testing the site, I'm being asked for different information on the marketpress checkout depending on whether I'm checking out from the main site or a subsite:

1. When I try to checkout from the main site, it asks me for my email address only
2. When I try to checkout from the subsite, it asks for for full info (name, address, etc.)

I've been able to successfully test an order through the subsite, but I'm getting errors trying to check out from the main site.