Ok, you've got all kinds of stuff going on here. Squats first and I'll go from the top down:
Walking the bar out: don't have your hips so far behind the bar. It's a waste of energy, get under it and arch it out of the rack.
Traps and upper back: lock them in. You rounded your upper back from rep 2 on. The weight is too light to tell if it is a technique issue, weakness, activation issue or whatever. Just get your upper back stronger and focus on keeping everything tight on every rep.
Middle Back/Lats: Pull down on the bar, this will depress your scaps, set them on your lats, and help keep all the other stuff tight. Also, this will keep your elbows under the bar.
Lower Back: looks pretty solid on the first rep. Take your time and get it set everytime.
Hips: Here is your biggest problem. Zero mobility and zero external rotation. Drive your knees out when you squat. This is the reason why you are not squatting very deep. Driving your knees out will be very hard for you at first because it looks like you have weak hamstrings (can tell from the knee tracking and comprimised ankle stability) and weak glutes (because you arent driving your knees out).
Deadlifts look pretty solid but, again, weak glutes and hamstrings are holding you back. Try to pull in one smooth solid motion. Get the salck out of the bar, load the hamstrings, then think leg press until you get to your knees, then think hips forward to lock it out.
Hope this helped.