Do your chickens have false alarms when it comes to laying? On a few occasions I catch a hen in the nestbox, and I go back out after she's "done" and there's no egg. It hasn't happened often, but the "false alarm" today was one of my only 2 green egg layers, so I know for a fact she didn't lay after getting in and sitting in the box for a while. I've also seen a few other chickens do it on occasion. Is it normal?