Thank you everyone for replying. This morning, I gently shook them, and could hear liquid moving, so I knew they were rotten. This is the first day they did that.
So,I cracked them open, and I saw that they had started developing, because I saw red tissue and stuff, but the weirdest thing was, the yolk was boiled. Like a boiled egg. It was separate too.
I know these were developing normally, because I candled them early on, and saw the embryo and blood vessels.
I had another egg do this too, the yolk boiled. But I just thought it wasn't fertile. Because I never did see blood vessels or anything.
This is so weird.......