Has anyone had a cat still urinating outside of the litter box after bladder stone removal?

My 12-year-old spayed female had two 1 cm struvite stones removed three weeks ago. We had taken her to the vet after she suddenly started peeing on our wood floor in the sunroom, and she was diagnosed with bladder stones. After surgery, she was kept in the bathroom for one week and used the litter box provided. When we let her out, she continued using the box for a few more days. Then one day she peed on the floor again, then again a few days later, then it became daily. Now she has done it twice in the last 24 hours, always the same area. We used every pet urine cleaning product we could find in stores and a few homemade ones thinking maybe she could still smell it. We put a litter box in the area where she is doing it. Nothing has worked. I am trying to get a urine sample to take for another urinalysis, but I'm wondering if this could be behavioral, basically a habit continuing from when she had the stones. She otherwise appears to be feeling so much better.

Has anyone else experienced this?

I know it has happened, but not sure this long after the surgery.  I suspect the area is not getting completely clean.  You're using an enzymatic cleaner, but I'm wondering if it's getting down deep enough.  Wood floors are tough to clean once they get urine in them.  I'm guessing you need to let the cleaner soak into them.  If you put the litter box right on top of the spot, what happens? 

Have you tried Cat Attract litter?  It's supposed to bring them back to the box, but until there is absolutely NO smell left on your floors, it may not work.  You may have to end up covering up that spot with a piece of furniture or a plant or something .  I just read that the new way of decorating is NOT having furniture up against the walls

Good idea, though, about having her urine rechecked.  It's possible she has another issue, maybe a UTI vs stones.  Hopefully NOT