I have three cornish cross broiler chicks and a barred rock roo chick. They're maybe a week old now. I weighed them because the size difference is already showing between the broilers and the BR roo. I have two heavy broilers and one light one. Noband is 111g, Leftband is 104g, Rightband is way behind at 86. Blackie (the BR chick) is 62g. Is there something wrong with my little Rightband? Is it possibly just a little pullet?