FatCat gave up on his litter tray years ago so I'd forgotten what it's like. When will my oh-sho-adorable kittens stop doing so many utterly rank poos in the litter tray? We have renamed them the Shittens.
I have slowly switched them from Royal Canin kitten dry food to Miaowing Heads kitten dry food (it's grain free) but I don't think it's that making the poo squidgy and stinky as it wasn't great before. They're still having a pouch of Felix "as good as it looks" at night which they love.
I don't know if it's one cat or both.
Will their digestive system(s) settle down? It's been ages since I've had kittens.