I think that different breeds are just naturally paranoid, it's not what you are doing, it's just the reaction that is with in them no matter who you are. Also I don't know how old they where when you got them and how much you were able to handle them day to day? Sometimes if they are already...
I absolutely love my chickens and recently I added a milking goat, Truffle to live with them! It's working out fantastic, just don't make the mistake that I made if you do something like this, don't have a deep water bowl for the live stock. I had a sad day when one of my chicks ended up going...