Have you look from behind to check your setup positions? You should! Can you see the difference between the two position. Yes, the camera angle is a little skew but what else?
Look at the pictures below, you will see the difference.
Picture on the left, her right hip is a little high and her spine was leaning towards the target. Picture on the right, hips are almost level to the ground and the spine is straight up and down.
Next time when you practice, ask a friend to check out your butt for the perfect setup.