Sister Wives can be a bit frustrating because the show is so far behind that viewers know a lot more about the lives of the family than they do when we’re watching them. We’ve seen their futures, and their pasts before they have. Since things went off the rails in Season 15, though, once they catch up, it can have disastrous consequences.
A huge reason why Kody and Janelle had that huge fight in Season 18, Episode 3 is because they’ve witnessed themselves saying things about themselves that they don’t like. We can get an idea of what they’ve been able to see by some of the things they reference, like Kody calling Janelle “the Teflon Queen.”