I’ve tried adding oyster shells! I have one hen of four whose eggs continue to be soft on the narrow end and occasionally, the whole egg is soft. This has been an ongoing problem for months. I allow them to free range, but tried stopping to make sure the hens were eating only their calcium rich layer feed, but no change and none of the other 3, as far as I know, have laid a soft egg. I’m hoping to identify a cause and a way of treating the issue. Any suggestions welcome!