When my character does persuasion, intimidation, deception, or performance checks, her charisma score gets added to the check -- not the modifier.
So, instead of getting a +4 bonus (+2 CHA and +2 Proficiency Bonus), she gets essentially a +16 (+14 for Charisma, + 2 for proficiency)
Now while a part of me doesn't mind this bug that is way in my favor, what's fair is fair, so I feel it's my duty to report it!
(And Larian -- if you're reading this -- loving the game!!!)