When you look at your sock up to this point, is it inside out? Sometimes when someone makes their first sock on dpns, they knit on the inside of the tube. It's not the end of the world, but when you follow the directions for the heel flap correctly, it's opposite of the orientation of the leg.
If you have been knitting the cuff inside out, push it through your needles to reverse it, and then your heel will match.
If this isn't the case, then