devtrackers.gg
Looking into this!
EDIT: Fwahhhhh, found it! It's because of how close you're cutting it to the pillar beneath you exploding. That runs a reset proc that resets your damage mod as the intent is to knock you backwards off it (It's why your character lands behind where the pillar was rather than where the boss is)
Good spot, epic video, epic detail. TYVM. Fixed Monday.