Where was the leak from? Under the wafer? Perhaps the area wasn't completely dry when you put it on? I'm so sorry you are going through this, thankfully I have only ever had 2 bad leaks and that was just after I had my ileostomy done so I think in my case it was more like error on my part also with the changing size of my stoma at the time. Have you tried different appliances? Sorry I'm not a lot of help but more info needed, there are also some great hydro frames I use when I go swimming to give it that added grip and mine never moves. Take care and hope to be able to help more
Doreen