Hi. I have a two year cat who has always been very clean and used her litter tray, but very recently has started to go to the toilet in a certain corner of the room. I don't know why she is doing this and I don't know how to stop her. We also have a kitten who we have finally finished litter training. However, she saw the older cat doing this, and this morning copied her. Does anyone have any advice as it's driving me crazy!