I'm not sure what buff is doing it, and it doesn't seem to happen when I play Dante myself, but frequently when A Dante is in the party and I try to shoot a gun like the Tetra or any gun with projectiles that have a burst animation when they hit a target, the projectiles will prematurely explode right in front of me. I'm not sure but this seems to happen with my companion as well, even if they don't fire animated projectiles, their projectiles will still explode if I'm using a gun that has that animation.
I play in HDR on a 1k nits brightness monitor. These flashes in my face are agonizing and almost completely obscure my vision. It's forcing me to not use guns I really like.
Also my weapons no longer have any reload speed stat, it's completely gone.