When you see a payment going to an affiliate named BBC Systems, Inc, that is an affiliate sale made by JVZoo. If you opted in to allow your product to be promoted by JVZoo, then JVZoo is automatically considered an affiliate. When JVZoo makes a sale for you, the affiliate is listed as BBC Systems, Inc. because that is the parent company. This way affiliate payments show separately from the listing fees.
The 5% is for using JVZoo, the commission split is because JVZoo made a sale for you through the Product Library.
You can block every affiliate except for JVZoo. That is in the terms you agreed to when you signed up.