The bar appears to be traveling forward a bit -- slow down a bit so you can fix your forward knee slide (set them in the first 1/2 of the descent).
You're going lower than you need to, this is leading to some (not much) lumbar flexion.
You might also want to get your elbows down a bit -- I've had experience with this myself, it may take some getting used to, to feel stable with lower elbows. But you really should be fighting to get your arms closer to the plan of your t-spine. I've found this is easier to get a sense for, the closer my grip is on the bar. This will take some time.