ive read somewhere it's additive dmg so hard to see the difference after picking those nodes, but this is only what i read and it can be bugged as u wrote.

Most calculations in this game (that I have tested) is additive. Here is something that I use on my internal Wolcen guide.

The following stats are calculated as a percentage derived from a raw score. The bonuses to the score are additive, but are subject to diminishing returns. Percentile bonuses to the score are a percentage of the BASE score. * Damage (all types) * Attack Speed * Critical Chance * Ailment Chance * Dodge Chance * All Resistances

The following stats are calculated as a percentage. These stats do not have scores and thus, percentile bonuses to the score are a percentage of the BASE score. If the boost is ADDITIVE to the base, it will say “ADDED” in the item or passive skill tooltip. * Block Chance * Block Efficiency

The following stats are calculated as a percentage, but bonuses are multiplicative (so {1-bonus} * {1-2nd bonus} etc.): * Rage and Willpower Cost Decrease * Cooldown Decrease for all Skills * Stamina Regeneration Rate Decrease (needs testing)