Ok buddy imma a bit on the tired side bit gonna try and help you out.
Your Deadlift actually looks pretty nice but the weight was so light we really wouldn’t see much break down but, all in all looked pretty solid.
As for your Squat no offense meant here but, it looks pretty terrible. First cue you really need to try and not chicken wing your arms so bad bring them down a bit. This will help let you stick your chest up which is gonna help you maintain a higher upright position with a stronger spine position. Next STOP STARRING AT THE GROUND. Find a spot about eye level or slightly above and don’t take your eyes off of it. Your leaning over very far even for a low bar squat when you actually add weight to the bar your either going to turn your squats into a Good Morning or worse actually dump the bar over head. Either way ot goes all the above until fixed are going to add quite a bit a additional stress to your lower back making it hurt.
Stand 4-6 inches away from a wall and squat with your chest high while breaking at the hips and sit back keeping shins vertical. I guarantee doing what your doing right now you will drag your fore head up and down that wall until you fix it… After a few head bangs you will figure ot out. Do a few before and after each of your Squat sets and then mimick that movement with the Barbell.
Get a cheap ass pair of Chuck Taylors the shoes your Squatting and Deadlifting in are shit.
Work on these things for a month once figured out we can really focus on Screwing the floor and Using your hips to really blast through sticking points. Lastly Deadlifts especially Conventional Deadlifts are going to stress, fatigue, and make your lower back sore learn to love it.