My mace has a Superior Sigil of Renewal and my shield has a Superior Sigil of Energy, as well as my greatsword. When I switch to my greatsword while in combat, I gain 50% energy but I do not when I switch to my mace and shield.
I have tried the same shield with different main-hand weapons and I am able to gain energy successfully. I have also tried the mace + shield combo in the PvP lobby against golems and my energy also restores successfully, leading me to believe that this is a PvE problem specifically with that sigil + sigil combination.
To reiterate: A superior sigil of renewal on my mainhand and a superior sigil of energy on my offhand does not result in energy gain when swapped back to this set.
