what does it mean if ur cat just sits in its litter box like its a bed of something

Don't worry,it's not serious.
Many cats make that. Has he enough places where to sleep ? Has he small baskets of pillows to lie down? Trees with cats ? If not,you have to buy it to him.

But,you know,I'm a breeder with my mother,and our cats make that regularly also. It's a place where they feel safe! It can seem bizarre, but it's like that! Then,don't worry ^^

I hope that I helped you,and sorry for my english,I'm french =)