Something is off at setup or changing during the swing. The best thing is for me to look at your swing video and could tell exactly, but for now, Check these 3:
1. You think you're keeping your weight 60% on the front foot, but at some point you let go and slide some to the back foot and then don't get back in time and hit behind. 2. You not retaining the wrists setup through impact and flipping or throwing the club head just before impact. 3. You start to unwind on the downswing, but then your body stops and the arms/club/ hands are taking over. You want the body's rotation to be pulling the arms/club through impact and around to the left. This contacts the ball clean and leaves the divot after (as long as the ball is at or just before the bottom of the swing arc). Again, there are many little nuances that can disrupt the golf swing, so viewing your swing video is best.
Move Less ... Get Good! DUPLESSISGOLF