CAT: Male, 3-5 y/o, only cat, indoor only, above average weight, no known issues, 1 litter box.
The last three times that I have done a deep clean on my cat's litter box, he has made it a point to urinate approximately on the spot where the litter box was. The deep clean process (remove all litter, clean with soap and water, dry) takes about 10 minutes. Each time he has urinated, he's done it while he and I can see each other.
Is it just down to some amount of territorial nature? I have no issues cleaning the litter box any other time. I believe by the fact that I've seen him each time, he's trying to make some sort of point; but I'm not sure what.