It is not any more curious than the Birthday Paradox:
In a room of just 23 people theres a 50-50 chance of two people having the same birthday. In a room of 75 theres a 99.9% chance of two people matching.
Humans do not naturally perceive math. That's why such paradoxes are so counter-intuitive.
I have two children (out of ten) with the same birthday, eight years apart.
I agree about not naturally perceiving math ;-).