Welcome to BYC. Sometimes, not always, you will find a thin shelled egg can cause opportunistic egg eaters- meaning they don't intentionally break and eat the eggs, but if it breaks easily, they will clean it up.
If your hen intentionally breaks and eats eggs, you will probably have to get a roll away type nest.
If your hen intentionally breaks and eats eggs, you will probably have to get a roll away type nest.