Hard to tell from the side. My first reaction was that you need to put your feet closer together but by the time you broke the ground I saw that they WERE closer together, you just have really long legs and they kind of "bowed" at the start of your movement. I'm a shorter lifter so maybe a taller member can help you there.
In any case try sitting back more on your heels to start and keeping your head and chest UP throughout the lift. You start kind of parallel to the ground which just means you have to travel further to lock the bar out.
Do you have any videos from the front?