1. Your setup has the bar behind midfoot and hips too high. Get knees flush with the front of your arms (more bent knees).
2. Narrow your feet a touch.
3. You're taking the extend the knees cue too far here. Think of pushing the floor away from you to start the lift. The knees will extend, but the bar will also go up. Here it is not moving initially and then moves away from you before going up.