When your hens squat, give them a good scritching on the back and they'll love it. Don't forget to take them kitchen treats, or a handful of scratch when you visit them. Pick them up and they'll remember how much they love you. They're young, and getting used to the new lifestyle of being laying hens still. A lot of it's hormonal. Remember being a surly teen? I do. I apologize to my mom STILL.
I have one hen that thinks SHE's the alpha roo, and tries to dominate me. She hates it when I pet the other girls when she's around.