I had a similar experience when my chicks were younger. I got 10 RIR and 12 Barred Rocks. The Barred Rocks seemed really friendly and social and the RIR not so much. But now that they are all 5 weeks old they have seemed to grow out of it. Now when I go into the coop to care for them every morning they all run over even the RIR. So I think that they tend to be more shy and not as social, but in time I think they will warm up to you.
