It mostly happens on my necro with dagger mainhand. Bloodlust will just not stack even though i have the superior sigil on the dagger. On occasion it will stack to 25 as normal, but majority of the time on necro it bugs. On my other chars i dont seem to have this problem, their bloodlust sigils stacks normally. Its very strange :s ….Sometimes the accuracy sigil my necro has on offhand will bug too…Also i do not remove weapon or have any other stacking sigils on so thats not the problem either.