Greetings Wolcen Studios.
I have noticed a two-modifier combo that does not seem to function for Gunslinger's Brand. When the modifier Flak Handcannon is selected, it appears to prevent the Augmented Ammunition modifier from functioning. This is while i am also using the Immortal Offering passive node. I gain normal, predictable stacks of Immortal Offering of only the two ailments listed on my Gunslinger's Brand skill tooltip while using both of those modifiers. When i deselect Flak Handcannon, then i regain the randomised stacks of Immortal Offering due to the Augmented Ammunition modifier.