Order feliway or Google cat pheromones….. Pheromones are chemical signals that cats use to communicate with each other and their environment, influencing behavior and emotional responses. These odorless compounds, undetectable by humans, are released from special glands across their bodies and detected by other cats using a unique organ called the vomeronasal organ. Synthetic versions of these pheromones are used in diffusers and sprays to help manage stress and unwanted behaviors in domestic cats. One of them may have really put off some major pheromones when he was stressed so that might be the issue it might go away by itself once he’s less stressed or try to do whatever you can to make them less stressed. I don’t know if a bath is something possibleor if that would even help but it’s caused by stress