Really stupid question (about the bullseye)

I have 11 hens. I don't have a rooster and have not had one for about 2 months. I cracked an egg today and there was a very obvious bullseye in both yolks (double yolker). I cracked another and yet another very obvious bullseye. I don't have a rooster. I don't get it. I do have one very aggressive sometimes roostery looking hen. I am assuming it is a hen anyway. It is about 5 months and does not crow and I think is laying plus she squats when I reach to pet her. Would a rooster squat? She is a tall chicken with a very prominent comb but her tail is not roostery at all. I can't find my camera but will look tomorrow and try to post pics cause I am confused. She is a production red.

 

Ok I think my rooster is in drag. He is over 5 months old and just now showing rooster signs. His sister is already laying and has been for several weeks. From behind he looks just like a hen. From the front he looks like a sort of masculine hen but mainly very henny. He does have longer thicker legs and he is taller but where is the beautiful tail??? Where is the crowing? He is chasing the girls around and trying to mate. That just started also. I thought he was just trying to move up the pecking order until the last few days. He also squats when I come around??? He is very loud and vocal. He even sits in the nest box just never lays an egg. Is he confused or am I ??? LOL

I can't find my camera. Somehow it has walked off. I am still looking though