Do you have more than one cat and more than one litter box? If so, I have a question for you.

I have 5 cats and three litter boxes. The way my cats use these litter boxes is odd, at least to me. For a period of time the cats seem to use one box for poop, one for pee, and mix it up in the other one. Then, for seemingly no reason, they change it up. Then they poop in another box and pee in another, and then sometimes they only use two boxes, and the third box will hardly be used. It changes like this on a regular basis.

Do you notice this with your cats? Can you explain why this happens?

And a supplemental question: why do they always piss right in the corners of the litter boxes? It’s so annoying.