It works perfectly fine on armor but i noticed something weird on weapons:
When I had one enchant, my fire weapon enchant had about 250 charges (at max dmg), now when I created a weapon with 2 enchants, I used fire enchant with ~250 charges and frost enchant with ~130 charges, So i thought i would have atleast 130 hits before i need a recharge, but after hitting about 10times I noticed that my weapon had used almost half of its charges - so with other words, eventho i used grand soul gems, my charges went down to about 10% of what it was before using dual enchants. Did anyone encounter the same problem?