I know somebody already commented this, but this bug was not fixed in version 17.5 so I'm going to put it here in case you didn't see it.
"I have encountered a bug while playing the game. Even with influence on level 5 with member A, I still cannot use it to stop member A from bullying member B."
So I have a group with six members, and there's two cliques. One with five of the girls and the other one has the sixth girl in a clique by herself. Is that supposed to happen?