We need a video to short things out. What did you notice while viewing your own video? It's nice when you can start to catch the likely causes of these things yourself.
With only a five-pound increase from the previous training session, likely causes were your bar position being not over midfoot and/or moving the bar out of position (from midfoot) before beginning the lift. Rip has written many times about how sensitive the DL is to bar position as you get closer to max-effort attempts.