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[PROF] + [SPELLATK] issue with NPC's

I'm creating NPCs for my game, and I assume the "Global Magic Attack Modifier" is where I'd put the "to hit with spell attacks" from something like a monster card from dndbeyond. It keeps adding an additional PROF score to the rolls and I can't figure out why. In the case of the NPC I'm creating, it's a level 18th wizard so if it WAS the proficiency bonus it was using it'd be +6, but it's adding a +4. I can't figure it out, help! 
I think prof bonuses for npc's are based on CR not level. 
That would explain a lot!