Inconsistent Litter Box Use
I have two cats - 6 month old Siamese brothers. One uses the litterbox with no issues. The other will use the litter box (bowel movement), but then he'll go to another room and go again. Or he may step out of the box, take a few steps and squat again. He usually takes two or three tries before emptying his bowels. Let me emphasize, he is very good at going to the litter box for the initial bowel movement, but he never completely empties his bowel the first time.
I keep the litter box very clean, scooping it several times a day - almost immediately when I know it has been used. So when the kitty in question uses the litter box, it's clean.
Why does he insist on going in multiple locations? How can I break him of this habit? I've had both cats for 3 weeks. I've never had this much trouble with cats.