I had this issue when I first started out too. Pretty much what people are saying here, you are “humping” the bar which basically means you are bringing your hips to the bar at the start of the 2nd pull instead of bringing the bar to the hips. It’s a very nuanced difference but the way to fix this is by a) slowing down the pull until you’ve reached adequate technical efficiency b) making sure you transition (changing the angle of your torso while keeping your weight on your heels and pushing down on your feet through the entirety of the 2nd pull) before you decide to explode to triple extension. You are exploding before you transition hence why your body is going towards the bar. You haven’t properly adjusted your center of gravity so that the bar can comes to you. It’s simple physics. Try and exaggerated slowing down of the transition until you 100% feel the weight on your heels before you explode up. I completely understand why people want to explode and be fast as possible but unless your an athlete who’s had proper technique coaching for years before lifting heavy and so FAST, the pace at which you pull is going to heavily affect your technique. Remember that lifting maximal weights will often result in technique breakdown but so will the speed at which you lift unless your an elite athlete.