Cats are usually neat creatures but sometimes they may fail to cover up their droppings. this could be because the litter box is too small or cramped and the cat no longer feels comfortable going in it.
It could also be a health problem or perhaps the cat doesn’t like the litter in the box. Then again, cats have an attitude so maybe your cat is simply being a pain in the neck and wants to get your attention. Be thankful the cat isn’t crapping in your bed instead.