Anyone noticed odd about the conversion of the Aetheryte rings?

The first 14-16 rings I converted, hey I thought RNG is RNG right? But a few weeks in now crafting, converted aroung 30-40 rings and all I've gotten are elemental/main-stat materias.

Did they somehow remove crafting materias off the conversion table for aetheryte rings? O.O

Would be nice if I'm wrong about this. Can anyone check what they get from conversions of aetheryte rings if they have the chance.