Made a new character and took 1 point in charisma. When I got into arguments with the 2nd source hunter (no AI) after the drunk legionaries and charmed orc events I wasn't getting a boost to my RPS wins. It was the base 3 no matter if I chose intimidate, charm or reason. Companion has 0 charisma.

Tried an experimental character. At character creation I upped charisma to 2 and then took politician. The character sheet clearly says I have 4 charisma but when I actually get into an argument I get 6 points (3 base + 3 charisma bonus) for each RPS round I win.

For some reason there seems to be a -1 modifier.

Apparently this is only been since the recent patch but I don't see it in the notes so I'm if this is working as intended.