They are still young and trying to figure things out in this new and confusing time.
When the ladies lay their eggs they will always lay in the same nesting box every day, they will impatiently wait for someone to leave their usual nesting box so that they can lay theirs.
Have you tried moving some of the eggs into a different nesting box since all of them share the same one. Maybe the new ones need to see that they don't have to lay all in the same one. Or you could put some fake eggs in the other 3 nesting boxes.
It would be good to do this before the new laying pullets start getting in the habit of their nesting box.
When the ladies lay their eggs they will always lay in the same nesting box every day, they will impatiently wait for someone to leave their usual nesting box so that they can lay theirs.
Have you tried moving some of the eggs into a different nesting box since all of them share the same one. Maybe the new ones need to see that they don't have to lay all in the same one. Or you could put some fake eggs in the other 3 nesting boxes.
It would be good to do this before the new laying pullets start getting in the habit of their nesting box.