Why are they not covering their poop?

One of my cats has decided that they’re not gonna even try to cover their own poop when they use the litter box and I don’t know if this is some kind of litter strike because they don’t like the litter anymore. I don’t know what I’m doing wrong here. Litter box is cleaned daily and fully washed out weekly. My entire house smells like shit because one of them won’t cover their poop

Added: none of my cats are declawed. The only way I would ever have a declawed cat is if I adopted one that had already been declawed in the past. I have 2 cats and 2 littler boxes and but they both use each box. I have a 3rd box in storage because I put it out and they completely ignore it. I’ve used the same litter since they were kittens too. Both are girls and one is fixed, inside cats only