Friend or Foe?

How do I not understand chickens?

Last night, due to my oversight, leaving the egg port open after cleaning, Baked decided that she was going to sleep on the roosting bars and when Spoon tried to get in, she wouldn't let her, so Spoon thought that sleeping in the shed might be a good idea.  All was rectified when I shut the egg port and moved Baked back to the nest box.  Spoon sauntered in as though nothing had happened.  However, the thoughts of Baked and Spoon becoming best buddies was dashed once more.

Tonight, they are both in the nest box and by all accounts Spoon has the prime position.

How does that happen?

If anyone can offer an explanation I would be most grateful.