On Sorcerer, got Liath’s Machinations gloves (50% of Fireball converted to Lightning) and Plasma Ball talent (50% of Fireball converted to Lightning). Fireball now reads “Scales with Lightning, Intelligence, Spell”. Removing either instance of 50% conversion returns “Fire” to the scaling. Talents which affect lightning damage (penetration, % damage, crit%) are not affecting the Fireball tooltip. Talents which affect fire damage are affecting the Fireball tooltip. This contradicts the scaling indicated.
I believe a similar bug is occurring for Fire scaled Warpath on the Paladin/Sentinel.
Fireball 100% converted to lightning (with Liath’s and the talent) is still not scaling correctly. Strangely it appears to now scale with both fire and lightning things. Example: My Fireball says 3038 dps. If I put a point in Pyromancer (fire damage and ignite chance), it goes up to 3070 dps. If I put a point in Ceraunomancer (lightning dam and shock chance), it goes up to 3075 dps (from 3070). 3% fire pen then brings it up to 3151, while 3% more lightning pen then brings it to 3160. Now, I understand Liath’s may convert Ignite chance to Shock chance, but it is scaling with Fire modifiers more than Lightning.