My litter box has the option for top entry or front entry. Opened the front entry since my cat likes to poop on the lid sometimes for who knows what reason. Happened to be in the room when he used the litter box just now. He doesn't turn around. So he poops at the entrance, which means spilling out will be inevitable, either because he shot it out or because he stepped on it on the way out. Any idea how I can get him to turn around?