I think it’s happened before that moderators have given wrong answers. I think I’ve given some answers that needed correction. If that’s the case, and another moderator sees that the answer is wrong, we correct each other.
Much more often, a moderator will give an answer that is not exactly wrong, but open to disagreement or can be clarified from a different point of view. I’m on one continent, and the other moderators are on another. I have a heavy background in linguistics, and most other moderators have been trained in English the traditional way, and that sometimes leads to varying perspectives on language matters. If you pay close attention, you’ll notice that Alan, Amy, Mister Micawber and I correct each other’s answers, or add another perspective to each other’s answers, with relative frequency. Once in a while we even have to apologize for our own answers.
Some of the funny disagreements happen between Amy and me, because she is from the East and I’m from the Midwest, and sometimes we can’t even agree on what to call some sandwich or soft drink.