Bullshit-sensitivity and cynicism are practically synomyms I'd say. It feels counter-intuitive to find cynicism positively correlated with prosocial behaviour (which the article defines as donating to and/or joining a charity.)
The headline 'Bullshit-sensitivity predicts prosocial behavior' contradicts the summary from the abstract where it basically says: Profoundness-receptivity has a positive association with prosocial behaviour whereas bullshit-receptivity has a negative association with prosocial behavior. So if you go by the abstract the results match your intuition!
Bullshit-receptivity = tendency to perceive bullshit sentences as meaningful
So, BS-S is not BS-R, thus there is no contradiction. Mate, the guys wrote a paper about it, they're not going to have the abstract contradict the title.