I've gotten ones like that from the grocery store before. My first thought was if they're using them for customers then it must be ok but then I stopped and thought about the conditions typical chicken mills have and if it was causing harm they likely wouldn't care :/
They probably wouldn't bother to spend the money to fix the problem if there was one.
Sorry, guess that's not very helpful.
That is not that unusual and not a big problem. If it is only one hen doing it, it is an individual hen issue. If it is the entire flock doing it, it is a flock issue.
If you are mixing oyster shell with your feed instead of offering it on the side, you might want to offer it on the side. That would be a flock issue. If it's only one hen doing it regularly you probably have a hen with a defective shell gland. It doesn't hurt the hen to lay an egg like that. It does not hurt the quality of the egg. It is still safe to use. Lots of our hens lay eggs like that.