In the last season or so of the build team, the dynamics had changed. Keri and Tory, who had gotten along fine before, seemed unable to keep their dislike of each other out of the show. It went from "Okay, that's a pretty funny prank" to "You are actively trying to hurt each other." At least as I recall it.

I don't know, maybe they worked it out. But I do recall a season or so that was genuinely uncomfortable to watch, because of the dynamics between people on the show - and it was a distinct change from previous seasons.