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In general, spontaneous sex reversal has been described as the result of pathological conditions (e.g., ovarian cyst or tumor, diseased adrenal glands) which cause the left ovary to regress. Residual tissue in the right ovary proliferates in the absence of a functional left ovary. This...

https://ufdcimages.uflib.ufl.edu/IR/00/00/30/37/00001/PS05000.pdf Here's one I found.

Are those the only chickens you own?

Ok. If there are no chickens around you, and nobody put the eggs there, then scientifically speaking your hen cannot have chicks that she hatched.

I am searching for it. Though it may have been wrong, I believed it. Said something about a left or right ovary that stays small or something, and when the hen changes gender it turns into testes. Now that I think about it, it doesn't seem very plausible.

No. You may not have noticed it, but somehow a rooster got to her, or somebody put fertilized eggs under her. Are those the only two chickens you have? Do they free range?

Yup, that for sure is clear. No clue how the chicken managed to hatch eggs. Somehow a rooster had to have mated with her, or somebody slipped fertilized eggs under her.

Me either. It's crazy what nature can do.

Both chickens are hens though. It doesn't look like one changed into a rooster.

Actually, there was a study and the hens that change to roosters fertilized hens, and those fertilized eggs hatched. I'll try and find the article.

Are you positive the other chicken is a hen? Do you have neighbors that own chickens? Hens can retain roosters sperm for 2 weeks, if I'm not mistaken. So there is no way it could lay fertile eggs from 6 months ago.