From what I can tell there are a few issues where the wiki is either outdated or has slightly incorrect information. I assume that the wiki was written before Jenna's route was finished. In the final game when given the choice of saying I'm Gay or I'm Bi, Chase will elaborate that he prefers male partners and that his sexuality is complicated to him. In either choice Chase will mention to himself that he is actually Bi, and that he typically just says he is Gay to avoid having to explain it or confuse people.
Also the only way to initiate romance with Jenna is to say that you are Bi when given that choice, otherwise the romantic scenes are replaced with their friendship counterparts.