The ability needs to be capitalised Charisma and not charisma.
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You only need the bit you have in brackets if you want to over ride the automatic calculation of the spell save DC and attacks. For example if a caster had a magic item which gave them a bonus to save DCs or attacks you would add the bit in brackets. Otherwise FG will calculate the save and attacks automatically.
If you want to override the ability score modifier you add in the parenthesis text. It should work without the extra text if you are good with the modifier of your orc's charisma. For the orc shaman, did you delete all of the spells, close the npc, then reopen the npc from the npc list? That will repopulate the spells. It may also relink the spells' to the proper attribute.
At least I would start there.
[5e] I'm looking to add an effect on a NPC card where the creature will take an additional +10 radiant damage each time they're hit by radiant damage. I have it entered as "Each time Drafend takes radiant damage, they take an extra 10 radiant damage." The problem I'm having is it's applying as an additional +10 radiant damage on his own attack for a single time. Any help would be appreciated. I've tried putting "10 radiant" in the vulnerabilities section, but it's setting a damage threshold for partial vulnerability.