Well, the first issue is "trying a max" without a spotter anywhere near the bar. For regular training, fine, but with anything close to a max (let alone trying a new max), don't be dumb.
Tough to tell from the angle, but I'm about 90% sure your glutes came up off the bench as soon as you started to press back up. Stay tighter neck to heels, plant your feet, no dancing.
Good grind through the sticking point though.