That's possible, I hadnt though of that! I just shrugged it off as a glitch. The kids loved it though! They find weird eggs fascinating. We have also had humongous eggs lately. Got a double yolker the other day!
We havent had any recently, but we have also had soft-shelled eggs in the past, where it looks like the hen only put on a membrane, and forgot the shell! The kids loved playing with and squishing those...
Its funny the things you find out from having chickens!