The quality of the vid is really dodgy but a few things:
1) did you see how as you were setting up when you lowered your hips the bar rolled away from you and you just sort of rolled it back a bit and then proceeded to deadlift it? Stand with the bar over your midfoot, grip the bar, and then KEEP THE BAR STILL while lowering the hips and your knees will move forward. Stop when your shins hit the bar without letting your shins push the bar away. Then raise your chest, tighten your back, etc. That should be how you set up.
2) notice how when you're lowering the bar it makes a curved bar path because it has to move out past your knees. Stick your hips back first before bending your knees.
And that weight looked simple for you. Stack some plates on
![Big Grin](https://startingstrength.com/resources/forum/biggrin.gif)