Our cat Rory is the proud momma of 4 beautiful month-old kittens. The kittens are doing great with the litterbox. But the momma is a different story. She's not burying her "deposits" in the litterbox anymore like she used to. They're in the box, but just laying on the top of the litter. I guess Rory thinks her stuff don't stink no more, which is not the case. The odor is unbearable. Anyone else have this problem?