I don't see a problem with your back, but just like most other people who post here your knees are dropping forward at the bottom.
Feedback greatly appreciated. I have been having some slight low back tension/soreness around 4th set on my volume day while doing Texas method.
Form check 300 for 5 - YouTube
I don't see a problem with your back, but just like most other people who post here your knees are dropping forward at the bottom.
To Rips point, you're dropping forward at the bottom. From my perspective it looks to me like you're lifting your chest early on these, which would 1) be a response to dropping forward at the bottom (thus, in front of mid-foot) and 2) would probably increase the chances of low back soreness/fatigue.
"SIT BACK" at the bottom a bit to stay balanced and keep the chest down on the way up.