Another Reason
While there had been previous tension between the two couples, it clearly did not good when the Queen directed Harry as the Youth Ambassador to the Commonwealth. William was offended when he wasn’t chosen and although he could have rejected this he refrained from getting involved.
Confirmation
Royal fans were intrigued about the possible conflict between the four but felt like it was just the press creating an issue that wasn’t actually there. Despite this, one time the couples got together for an interview in which they were asked about their speculated disagreements. William jumped in and quickly answered, “Oh yes.”