My grandmother is superstitious, so she boiled an egg, but after peeling it, it has a tooth-like mark. What's going on here?

Speaking of which, I'm scared, too I remember when my neighbor died in the village or our children got sick, my mother found raw eggs, told us to breathe a few breaths into them and put them in the position of the kitchen god, saying that the kitchen god would protect us. If the doll is sick or injured and has a wound, we will stick a few small pinholes in the egg with a needle, then shake the egg around the doll's head or around the wound and put it in the position of the kitchen god. It is said that Kitchen God will protect our health and take away diseases ... So ... a few days later, something amazing happened. A few days later, my mother took down Kitchen God's raw eggs and boiled them in water. When the egg was peeled off, I was scared silly ... the white and tender egg was covered with tooth marks ... My mother, my father and I were present at the time and were very shocked. My mother said that such eggs are not edible. If you don't eat this egg, something bad will happen ... Another thing is that my mother said never to eat eggs with double yolk. Eggs with double yolk are a sign of bad luck ... It's accurate ... I'm afraid, too. ...