You didn’t factor recombination. Nobody ever receives any of their parents’ exact chromosomes, except the sex chromosomes from dad - each pair shuffles up the equivalent DNA between the 2 chromosomes, resulting in 2 chromosomes that are each a mix of both of that parent’s chromosomes of that pair, one of which is passed on to the child for each pair for each parent.
You didn’t factor recombination. Nobody ever receives any of their parents’ exact chromosomes, except the sex chromosomes from dad - each pair shuffles up the equivalent DNA between the 2 chromosomes, resulting in 2 chromosomes that are each a mix of both of that parent’s chromosomes of that pair, one of which is passed on to the child for each pair for each parent.