Hello Eric,
I replied to your other post but just realized I didn't give you an explanation of the sidecart. The sidecart is a place where items go to live until they ship out with a subscription order. Usually grouping items together saves a bit on shipping so it is something many folks like to do. So an item in your sidecart will wait until there is a subscription order it can ship out with and then jump into that order. You can add an item to your sidecart by selecting the "Ship with my subscriptions" shipping method at checkout. When you start a new subscription the first item you will get usually spawns into the sidecart and then generates an order when we run the authorization.