Hen making odd sound

[Mari1]

One of my hens is making a new, weird sound. Now her sister is starting to do it to. She started doing this after one of my buff orpghingtons hatched her babies.

In the video she is sitting in a nest trying to lay, and another hen got into the nest with her to lay also. She (the black hen) has been making this sound while off a nest. Right now she's doing it while sitting on the ground behind me. What does this call mean?

This will be her second day doing this

 

[TheTwoRoos]

Totally normal.Hens do this when they don't wanna be touch and need privacy when laying eggs,she could also be broody.