>>187754
Yes, you're kicking with the leg rather than with the hip. You can see when you hit the bag your body is facing the bag, it should be completely turned and facing to the side like pic related. That means that instead of the leg coming up pretty much linear at a 45 degree angle, it comes up and then curves so that your shin hits completely horizontal. This requires rotating your torso, and pivoting your back foot (as the leg comes up) until it is pointing directly away from the bag. Think about it like swinging your leg over a really tall bike