Yeah she is crapping outside her box.
I use the sainsburys paws obsorbant and odor control. I used to put the hood on but she refused to use it, so I took the hood off.
I am sure its deep enough, 6cm's. I have changed the litter, used to be the grey clumping, but I heard this might be bad for a kitten as they may eat it and choke on it.
I use biological washing liquid with a brush to clean the stain, then apply the enzyme pet stain remover.
Oh she has 2 litter trays and does the same thing at both trays.
She is nearly 5 months old, maybe she is having a teenage rebelion.
As a precaution I have put some spare carpet under her litter trays to spare my carpet (I rent and don't want to piss off my landlord)