Have Infernal Sovering (electric) Thiefling enhacement.
My fire spellpower is 408 and electric spellpower is 144.

My bonus damage from Spellsword - Flame shoud be the same as from Spellsword - Electric because using higher spellpower value from fire and electric spellpower due Infernal Sovering (electric), but isn't.
Electric damage from Spellsword - Electric is several times lower, then fire damage from Spellsword - Flame, so it look like as Infernal Sovering (electric) Thiefling enhacement not working for me

Can anybody test it?

Tested on lvl 14 sorcerer with 39 ranks in Fire savant and 0 ranks in Air savant.