I don't really see a rounding problem. If it is rounding, it doesn't become any more rounded throughout that lift.
Your hips are a little on the high side, but not necessarily wrong. If you find you have back pain, you might want to work on getting some more leg drive into your pull. Hips lower and shins closer or touching the bar. You might even find that if you practice your pull that way and build your legs that you'll be stronger. Or you might not.
Good luck and happy lifting.