for the animation, it seems to be the critical animation has an error by one frame judging by how it only appears during a random crit, try checking the animation for any awkward rotation (one of the keyframes seems to be rotated in the wrong direction)
I'm guessing it only appears sometimes for you during a crit as you may be losing frames, the keyframe seems to be only one frame as well (this is guesswork)
try previewing the animation in sfm with the time slowed down, or maybe in blender with a shorter timescale
fyi I did some testing with this animation myself with host_timescale slowed down: https://youtu.be/91vT5tXnshM?t=35