Cats can have a wide range of reasons for relieving themselves outside of the litter box, so it's hard to say for sure. It's possible that the cat is trying to mark its territory, or it may simply be because the litter box is too dirty and the cat doesn't want to use it. Have you taken your cat to the vet recently? They may be able to offer more insight into your cat's behavior.
Cats can have a wide range of reasons for relieving themselves outside of the litter box, so it's hard to say for sure. It's possible that the cat is trying to mark its territory, or it may simply be because the litter box is too dirty and the cat doesn't want to use it. Have you taken your cat to the vet recently? They may be able to offer more insight into your cat's behavior.