So when I tempered one of my wands with Frost Augments, instead of the 13-17.5% Chance for Frozen Orb Projectiles to Cast Twice, I got 30.5% out of 23.5-32.5%. Buit I haven't been able to reproduce this with any other wand (all were 925 Item Power).

I see build guides (like at maxroll) showing the bigger range, but can't find any mention of what causes this. Anyone know?