The issue was that the V was not as clearly defined as I would have liked to see. I was nearly sure that one was female (about 90% sure). The other looked female, but was lighter in color than I anticipated. So, that confused me. I took pictures of both as they grew just to confirm or reject my thoughts. Thankfully, all of my Rees cockerels are clearly cockerels. I've had no problem identifying them. I've just had those two females that confused me a bit since the V wasn't clearly defined. I will be culling them both from the breeding program to hopefully work toward better autosexing in future generations. But, it was a good learning experience.