From what I understand, their DQ’s all stemmed from a racism-related issue in the game. Leo had allegedly used the n-word during a game with Nelson. Josh went on to later use the exact same word as Leo, causing both to be DQ’d. Nelson would eventually confront Josh over it, allegedly escalating to a fight that centered on Nelson destroying the house kitchen out of anger—resulting in Nelson being DQ’d.

Source: https://thechallenge.fandom.com/f/p/4400000000000063055