For the lockout of all the reps, the first two, you are just dipping your toes in the water. It is the deadlift equivalent of a touch and go bench press. Reps 3-5 look very good. The glutes are through all the way, the back is straight but not extended. In the future when you are doing deadlift reps, try not to bounce the weights off the floor especially when using bumpers cause they really bounce. Let it settle then drive. This doesn’t mean you need to reset each rep, keep you tension then hit it again. This will really help you in the long run develop your strength off the floor.