My friend bought two Sicilian buttercup chicks about 5 weeks ago. They're both pullets for sure. One of them has a normal comb/ its the right size for a chick that age, but they other one has a huge comb. I mean huge. Almost the size of a full grown hen. I am 99.9% sure its not a rooster because the plumage of this breed is very different between male and female. Is there a problem with the chick or is it just genetics or something else? Unfortunately i don't have any pictures.