Prince Harry’s chief of staff, Josh Kettler, stepped down after three months, and the executive’s exit leads experts to wonder if the rumors about the Sussexes mistreating staffers are true. “A revolving door of staff seems to be the norm for Harry and Meghan,” Helena Chard told an outlet. “Eighteen members of their staff have departed their team.” “Sometimes introducing new staff to a team can keep ideas alive, but this is an unusually high turnover of staff and highlights that something is wrong,” Chard added. In 2021, Meghan Markle was accused of bullying her team, but the former actress ad…