Double curse: Conductivity + Elemental Weakness

When I curse monsters with Conductivity, they get "Vulnerable to Lightning" mod.
Then I apply Elemental Weakness on them and they lose this "Vulnerable to Lightning" mod to "Vulnerable to elemental damage" mod.

Is the stacking hidden? Do they replace each other?



(Obviously, I have Whispers of Doom, the additional curse keystone...)

Do you do more damage with 2 rather than 1?

"

Is the stacking hidden? Do they replace each other?

Don't worry they stack. It's just easier to write this than :
vulnerable to lightning damage
vulnerable to fire damage
vulnerable to cold damage

Unless you are geared up for more then 1 curse at the time, the current curse is replace by the new curse you cast.

http://pathofexile.gamepedia.com/Curses

"

Do you do more damage with 2 rather than 1?

It's hard to say, lightning damage is wide.

"

Unless you are geared up for more then 1 curse at the time, the current curse is replace by the new curse you cast.

http://pathofexile.gamepedia.com/Curses

Like I wrote, I have "Whispers of Doom".

"

Don't worry they stack. It's just easier to write this than :
vulnerable to lightning damage
vulnerable to fire damage
vulnerable to cold damage

Thanks! My mind is in peace now.