If a cat is kicking litter out of the litter box then it's a sign that the litter box is too small for the cat or you need a litter box with taller sides to avoid the cat kicking the litter out of the litter box.
Cats naturally scratch in the litter and dig a hole before they urinate or poop and when they dig that hole they can kick litter out of the box.
You can try getting the cat a larger litter box or a litter box with taller sides or even use a cat litter that has larger particles to avoid the cat kicking out litter in the box.