This could be a whole article.
Weightlifting shoes can be tricky to learn.
You have to make sure you REALLY root hard and keep the heel locked in.
The heel pushes you forward a little until you master the shoes.
You can see that your knees are travelling forward (which they should) but in an awkward way.
Next time, set up, root hard and open the knees and sit straight down.
If you are able to keep the root, your knees will travel forward normally, not herky jerky as they do here.
Changing equipment always present challenges.
You have to learn to use it. These shoes are no different.