Hey Heather,
You should only have 8 emails in there. Only the "Root" emails should be added to the stream. The challengers within that email should not be added to the Stream.
So if you have a Champion/Challenger email called "Email" and a challenger under that email called "Challenger 1", you would only add "Email" to the stream. When "Email" is cast, it will perform the test defined within "Email" automatically and send the Challengers to the percentage declared in the test.
Best,
Will