Not sure if It's a bug/glitch...
But when I choose slot 4 weapon, and then increase the damage with a trigger "Change Projectile power", setting the value to 1.25 which supposedly to increase the weapon damage by 25%, but instead it for some reason decreases the damage by alot.
This happens to if you change the damage for slot 4 weapons, I'm not sure about the other slots, but this happens mainly for slot 4 weapons.