Couple of things...and no yelling.
You don't REALLY do a set of 5, you do 5 quick singles. You reset and do the kabookie dick dance before each rep, you need to stay in position.
The rep with shoes is also a rep with the belt. I don't seen anything particularly wrong with either set, perhaps the back *could* be pulled harder into extension, but I don't see a change in the back during the pull, so I'm not overly concerned about it.
The set is ridiculously light for you, so I don't know how much I have to offer.
Last thing, I *think* you may be back on your heels a little, but it's very hard to see from this angle, and with the weight so light, lots of little form slips can get through. I *think* you are rocking back, but as I said before, the kabookie dick dance makes it tough because you don't get set, squeeze into position, and then pull...and without being there, I'm limited in what I can see.
What should you do?
Try setting up, with your shoes (and belt if you like), squeeze into position, resist the urge to bounce around and do a set of five. Let me set a video from the front angle so I can get a better sense of where your shoulders are in relationship to the bar.
And add weight to the bar, of course.