I would keep them in for the mornings for a week or so to see if you notice a difference, they could be so distracted by the grass that they aren’t consuming enough layer feed and calcium ... try it and see :)
I bragged on here once because I was getting 18 from 20 hens .... well now we combined those two flocks and we’re getting 8-10 :(
They are still trying to decide who will be the leader :)