Strange...

[grasjm36]

Has anyone's girls ever layed an egg while sitting on the roost, possibly at night?

 

[DTchickens]

All the time for new layers or if they don't have proper nesting areas.

ETA:Sometimes it can also just kind of be an accident as well..

 

[ranchhand]

I have had two "aerial layers". Both times, it turned out they were scared of the other hens and wouldn't get in the boxes because of it. Once I separated them they used the box.

 

[apukanski]

Mine did that a few times, I put a light on a timer to get them up earlier. It seems to do the trick.

 

[KatyTheChickenLady]

I have two that have done that recently because they don't like their new nest boxes.

 

[redstars]

I have found a couple on the roost also.
They have just started laying this week and I thought maybe they just haven't figured it out yet.
Some go in the boxes and some don't but I guess they will in time.

 

[emay4short]

Had the same issue except the eggs were shell-less. Here's the thread, I got some good information.
https://www.backyardchickens.com/forum/viewtopic.php?id=254223

If they are young hens, they should figure it out eventually. Good luck!