Bloody comb.

[aart]

They are letting you know that they do not have enough roost space.
And the coop is too small. You should either increase the size of the coop and run or downsize the flock.

Yes, This^^^

You need at least twice as much coop space and roost length for 6 birds.

 

[Brady bunch]

We will work on giving them more space in the coop.

 

[aart]

We will work on giving them more space in the coop.

Great!
May be even more important if you live in a harsh winter climate.
Please add your general geographical location to your profile.
It's easy to do, (laptop version shown), then it's always there!

 

[Cryss]

Each bird needs a minimum of 4sqft coop space so six birds need 24sqft. That's like a 4x6 coop or 3x8.
Run space minimum is 10sqft/bird so you need 60sqft so a 6x10 would work.
Good luck!