Squat: The bar is moving slightly forward when you are descending. I had the same issue a few months ago and it became a problem as I got closer to my 1 rep max. I worked on descending slower and focused on the balance in my feet.
Bench: Your foot placement looks too narrow and far from your body. Try a slightly wider stance and bringing your feet back at least 6” closer to your body.
It looks like you are starting the descent by flaring your elbows out. Try starting to move the bar down while keeping you elbows in more.
This is a good bench resource that might explain things better: