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Its because the hens are the sex link color and the rooster are carring the sex link color hidden. so you will get males and females that sex link color.
You could also breed pure breed sex link. Like RIR X RIW HENS=RIR Pullets and RIW cockerels
RIR or NH rooster X white rock hen =golden comets
RIR or NH rooster X white leghorn = red star
Chicks from these at day old pullets red of buff color. cockeral yellow or white color
Golden comet rooster have more meat than red stars.