I am currently at Tanner stage 3.1 and in a growth spurt. I have been growing taller rapidly but my hands and feet remain the same size, (7.5 and 10 inches respectively). I thought these were meant to grow before height?
I suspect that a few years ago, your feet were not size 10 nor were your hands 7.5 inches. You are just starting stage 3, but it was during stage 2 that your hands and feet grew, which would have been about a year ago.