Do you know which cat is doing this? If not, seperate them for a night or two to find out. Then take that cat to the vet for a urinalysis. Odds are you will find the one that is urinating outside the box has a urinary infection. That is the number one reason that causes cats to go outside the box. Urinary infections are painful and the cat associates the pain with the litterbox. Once any medical problem is ruled out, you should add another box....covered if the one you have is not or open if it is covered. You can try another type of litter too. My guess is that it is something medical since this just recently started.
Keep us posted!
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Purrs,
Munchie

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