I take it you have fed them since they were chicks? That is a usual response for
chickens, especially if you're pretty calm around them or talk nicely to them. When the Bride or I
feed ours, or anytime we go in the standup
tractor I made, they come huddling around, especially when I bring in windfall fruit and split it open for them. They, in turn, bless us with a rather exuberant amount of eggs.
In general, I think all is well there. They'll eventually not hover so much.