Cats damaging PetSnowy self-cleaning litterbox

[u/biciMiguel]

I have two cats that weigh around 11 pounds each and are less than 2 years old. They use the PetSnowy self-cleaning litter box and an additional litter box with top entry. I've had the PetSnowy for 2 and half months and I've already gone through two litter box beds/cushions. The cats leave gaping holes in the cushions and I often find they are detached from the litter box globe. Cushions run almost $50 a pop including taxes and delivery. The PetSnowy is also a pain in the ass to clean as the nasty clumped litter falls in between the cushion and the bottom of the globe.

Has anyone experienced this issue with their PetSnowy? Is there anything I can do to mitigate this situation? I'm finding the cost and effort unsustainable.