Hi everyone ! I have two cats (brother and sister about 1.5yr). Cougar, the male always covers his business in the box and is a very clean kitty, while his sister, Kaycey is a little piggy. She never covers her business, yet scratches the corners of the box as if she was. Is this normal?? Is there anything to help her learn to cover it up? Also she is an extremely smelly thing when she does her business. We've tried every food there is and it still all comes out smelling horrid. Any advice would be greatly appreciated.