The multiple endpoints fallacy also comes into play here. Instead of multiples of 9, it could have been multiples of another number, or any group of sequential

The multiple endpoints fallacy also comes into play here. Instead of multiples of 9, it could have been multiples of another number, or any group of sequential numbers, or sequential even numbers, or prime numbers, or... The odds of a particular remarkable thing happening are very low, but the odds of some remarkable thing happening can be much higher.