Help with my kitty grrr?

hello i was told if u change there litters around to much then they wont like going in there and using it. i have 3 cats and they use the same litter. so stay with the litter that they we used to fro day one and see if they go back on there or i know this is silly get some puppy past layer your couch with them and see if they will pee on there and help with not getting on your couch good luck