wet poo and regurgitation

Hi all, I'm caring for my first chickens and have noticed that most of them (4 or 5 out of 6) have wet poo. They product some regular solid poo also, but most of it is very wet, I use Stall Dry to keep the roost tray manageable. I also see them occasionally lean over and regurgitate clear liquid, I assume from the crop. But they follow up by drinking it up. If the other girls are nearby, they come running to eat it up. It's very unappealing to me, but I just assume this is ok? They are about 7 months old, I bought them at about 6-8 weeks old from someone in town. Barred rocks, RIR, and a Buff. They seem like fine birds other than that. With no previous chicken experience, I just want to make sure it's ok to eat their eggs. We are getting about 3 a day from the 6 girls.

Thanks for any input!