At the start of your first rep you jerk up and then get stopped when you get tension. You should first get tension on the bar by pulling a little and then actually do the rep

7

Yeah pretty much what everyone else said. You're ruining your starting position before the bar even breaks off the floor, so you need to make up all that lost ground on lockout. Need to build tension and wedge and not have your hips rise early

5

You’re very leaned over the bar and it’s making you have to over extend and pull even more through your erectors, wedge your hips in more and make sure the slack is fully pulled. Try and think of having the gap between your legs and arms become very small triangle, you can have your upper back and shoulder round, but you still want a rigid lower and to be more upright with hips a little further wedged in

3

Feet are way too spread apart.

1