It could be the food. I had my cats on Friskies. We changed to Meow Mix and their poo suddenly stinks so badly. They also have been barfing kind of frequently now. We just got them a bag of Friskies again today, and we should be back to normal poo shortly 😂💩 which also smells when they poop and run (not covering) but definitely a lot lighter smelling.
If you try different foods (wet too) and it’s still not working out, especially poo sticking to the bottom, a little vet visit might be good.
Wow that was interesting. Thank you for sharing.