You are losing upper back tightness by trying to jerk the bar off the floor. Don’t do that.
You need to squeeze your back into extension by lifting your chest as high as possible without dropping your hips.
Something that works for me: When you go to pull, don’t think about “pulling” on the bar. Think about getting your back as straight and tight as possible and then use the barbell as leverage to drive your heels into the floor.
Pull the “click” or “bend” out of the barbell, and then drive your heels into the floor.