Extending? No, heading is moving back.

Hey, Tom. Been a long time since being on here. Life has been throwing some curve balls and have had a lot to deal with. Now, maybe, hopefully can start back and try to learn this system. I've had this issue a long time and not sure how to solve it. What feels like when swinging the club is my hip is moving towards the target and my mid-body extending. Well, looking in a video that is not the case at all and my head is actually moving backwards - quite a bit in fact. Of course it's leading to problems - my entire circle is moving around. Any suggestions for trying to keep my head from moving backwards at impact? I have the weight forward, I'm driving off of my lead leg - but the head keeps moving backwards.