Hello
Is your son walking without holding on? or is he surfing around the furniture?
He is an early walker compared to my own three children - and also my youngest three grandchildren - none of whom bothered to walk till between 13 and 18 months
I should think that they all did this for a few days or weeks at first, except for one of the girls who was 18 mths before walking, but is now nearly 18yrs and training to be a ballet dancer
I think it could be that at first they remember walking in a baby-walker - or being supported by an adult which naturally places the baby's toes lightly on the floor.
I feel sure that his his walk will come right within a short time.