Hi
It looks to me like a combination of a thin shelled egg, which is not unusual with new layers and perhaps not enough bedding material in the nest boxes. New layers have a really annoying habit of scratching the bedding out of the nest boxes, especially if they don't have a decent lip on the front of them and then as the egg is laid and drops out of the chicken, it hits the hard surface below and gets dinked. Eggs with good shells will withstand the short drop onto a hard surface but thin shelled eggs will hole like this. I'm sure when you crack open that egg, you will find the shell is very weak, almost papery.
Ensuring that they have plenty of calcium available will help the shells to get stronger.