Looking for a little clarification on weapon enchants. I have a Lightning Staff with a Flame enchant. The blue bar is empty and I assume that the enchant no longer works (is this a valid assumption?), although it is still shown on my weapon. I have a flame enchant in my inventory, but when I go to the 'enchant' option, on my weapon, the flame enchant does not show up, although a Shock enchant is showing.
What am I not understanding about the process?