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You're doing touch and go deadlifts, especially when dialing in form (as pit said) it's better to let the bar come to a complete stop on the floor, set up, and pull. This will help with how you're losing a bit of tightness in your upper back as well, since you will have to set up again and can really create a lot of tension.
When you're starting your first rep you can hear a bit of a clicking noise. This indicates that you are not "pulling the slack out of the bar". There are lots of ways to coach this but I think the general "the bar should feel heavy in your hands" before you initiate the pull is a good start. This weight doesn't look heavy for you, so I would expect the weights to leave the floor a small amount during the set up of the lift before you initiate the lift. This is shown and discussed in this video: https://www.youtube.com/watch?v=WP0IFHkkRZ0
Could I get a form check for deadlifts?
Just up to 100kg (looks like 80kg but there's two 10kg plates on there) and although I'm not struggling with the weight I want to iron out any issues before I get heavier.
https://streamable.com/h9pb0v