Why do cats bury their poop?

No.But they do eat it sometimes. My indoor cats play with the poop. It's boredom. once you give other reasons not to get bored (like more toys and bigger place to run around), they'll STOP doing that. If they don't stop even so, get a top-entry litter box. It's harder for them to bring and fling their poop about when they have to jump out of the litter box using top entry.