Our 10 year old cat is refusing to squat in her litterpan. She just stands there and lets it fly. I have tried adding litter, taking away some of the litter, cleaning and scrubbing the pan. Nothing is stopping this. She has never been a sprayer (marking territory). She was a breeze to housebreak. The odor of her urine is getting stronger and stronger. Any ideas from anyone? She has ruined some of the tile in the bathroom where we keep her pan.