
So if you use the anything else than {{always=1}}, on a critical hit, the damage will be added twice. This is because it 'adds' an attack roll of the selected dice (so you end up having 3 dice, 1 of which is a copy of one of the previous r1 and r2 rolls that was selected on wether advantage, disadvantage or normal is chosen). Here is screenshot. The extra +6 shouldn't be here :