Yup, it's normal. Just hold your hand out in bow position and rock it up and down into high wrist to low wrist position and you can see the difference easily. I shoot just about all of them with a medium to high grip, no matter the riser design, so my draw stays pretty consistent. The exception would be for a Hill style, straight grip bow. They just don't like that grip, so it's heel down, grip it and rip it. That's one of the reasons Howard Hill, who was a big fella, had a relatively short draw.