What has happened to my egg?

I have a hen who lays this egg all the time..not sure why they all have oyster shell available all day long she eats the same as the rest....
I can't help identify the reason but maybe someone can!!
otherwise my hen is healthy and friendly!!
Other than the unsightly appearance, there's nothing wrong with the shell. Its hard, firm and strong and appears just as solid as any other egg with no weaknesses.

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