Not a coach, or experienced, so take with a grain of salt, await further advice, et cetera ...
These look to be too high to me, needing an extra inch or two of depth. The things that jump out to me the most are a) your back angle is far too vertical, you want to have back angle which is more like 45 degree (but keeping it flat). This is also causing your knees to come to far forward, and to keep sliding forward near the bottom. b) Your heels are raising, so the weight is moving from the midfoot. This is probably related to the prev. point. c) I can't be sure from this angle, but you seem to have the bar too far down your back.
Try to film these from waist height and rear 45 degree angle next time. That makes it easier to see important things like depth.