Mixing Attack Types

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I've notice that combining some attack types under specific circumstances (or maybe in general for some of them) does not work. I recently owned a pair of Gloves of Leuceticious that add the electricity attack type to your weapon. While they worked with swords that do only physical damage, and poison damage, they would not work with weapons that did elemental damage, (fire, cold) or weaponmagic damage.

It seems to also effect the type of damage you can inflict while holy posession is cast on you, and in an inconsistent manner. While i can use dian cecht's blinding with a weapon blessed otherwise, i cannot bile with holy posesssion, and in my specific case, while wielding a govannon blessed weapon.

Anyone else notice this? Is there maybe some logic behind it that im just not getting?