@Teejay1 are you talking about the rear / base of the seat popping off when you swivel around ?
It's the side catching on the stud underneath as it's swivelled. I took it into them to have it replaced, they replaced the back only and with the wrong colour. Took it back and the rest trim was hanging off. Still not replaced the sides as they said they would. Going back to have the surround replaced. Hopefully the correct colour this time.