Rocket Lab reported an earnings beat this week, then its stock went down. That's not how earnings beats are supposed to work.Rocket Lab (RKLB +0.64%) reported its third-quarter results on Monday evening. As of Wednesday evening, the stock was down 3.7%. Based on just these two facts, you'd probably assume this means that Rocket Lab missed its earnings targets on Monday.But it didn't.In fact, according to data from The Fly, Rocket Lab actually beat earnings quite soundly. Sales for the quarter, which analyst ...