Trained proficiency should be +2, not +4.
I just rolled up a test kobold oracle and gave them Ray of Frost through Spellscale Kobold and it looks like it is calculating correctly. If you click on the spell for details it will give you the breakdown of where the spell attack bonus is coming from. When I do that, I see:
Quote:
Proficiency Level
(Trained)
•Ability Bonus
(+3): Charisma 16 (+3)
•Base Bonus
(+3): Character Level (+1), Trained Proficiency Modifier (+2)
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Which is correct for the sample character I rolled