The hair color of the occult children constantly changes to random.

No. This is another problem, appeared after the release of the life and death. This boy in the first screenshot is spellcaster. He was born with brown hair. But now he is gray. Recently I saw him on the beach, he became red. Hair color changes randomly. Also these vampire twins. They were born with black hair. But one of them became blonde. And I often see them on the street with different hair colors.