We have three litter boxes. They all seem to want to use the same one. So one day the bathroom box is the box du jour a few days later it could be the kitchen box or the laundry room box. So scooping is done and done and done to keep the box clean while they ignore two perfectly clean, perfectly unused boxes.
The other day for reasons I'm not sure of Isabelle decided to pee in the hall (right outside the bathroom that contains a box). Shortly before she had a hissy encounter with Tigger so she may have been POd. She announced her act (by scratching on the nearby door in a half-assed attempt to "cover" it up) so I was able to clean it up and no stench remains.

Then the next day Tigger pees in the bathroom, on the mat right next to the box. A little later she poops - on the mat right next to the box.

Tigger has been feeling better lately so of course they are all chasing her - hissing and growling to follow. Boots has been a particular PIA the last few days and neither one of the girls are happy to see him.

I still have to have my bedroom off limits to them as I haven't managed to get rid of the stink in there and am not sure where it is coming from. I can get down on my hands and knees and do the sniff test and don't smell urine but walk into the room and you smell it. I've done the black light thing looking for another spot to no avail.
Isabelle had a complete checkup before we adopted her in September. She had another checkup in December by our vet. Tigger has seen the vet on numerous occasions since December and Boots was just at the vet a little over a week ago. They are all peeing and eating normally (well other than Boots and the dental floss and that ain't normal lol) often enough - not too frequently and not too much.
I've had cats for over 30 years and have never had the peeing around the house like I do now. I have more boxes than ever, clean them more often than ever and am running a feliway diffuser for the first time ever. We have introduced new cats to old cats on numerous occasions and never had this problem.
This is the first time I've had two females that weren't from the same litter. I wonder if maybe wasn't a mistake. Either way they are here to stay so I've got to figure out how to get them all to chill out. If that doesn't work I have to get me to chill out

W
... The other day for reasons I'm not sure of Isabelle decided to pee in the hall (right outside the ... right next to the box. A little later she poops - on the mat right next to the box. ...

Do you use covered litter boxes ? Some cats don't like to use covered boxes if they're afraid of being attacked on the way out.

Are you sure it was Isabelle who did this the first day and Tigger the next day ?
... The other day for reasons I'm not sure of Isabelle decided to pee in the hall (right outside the ... right next to the box. A little later she poops - on the mat right next to the box. ...

Do you use covered litter boxes ? Some cats don't like to use covered boxes if they're afraid of being attacked on the way out.

Are you sure it was Isabelle who did this the first day and Tigger the next day ?
I have covered and uncovered. The boxes are of varying depths. I have two that don't take a very big step to get into (so Tiggy won't have a problem because of her arthritis). One of them is covered the other not.

I know who peed where because I caught them both in the act.

Wendy
... I have covered and uncovered. The boxes are of varying depths. I have two that don't take a very ... them is covered the other not. I know who peed where because I caught them both in the act. ...

Did they pee and poop close to a covered litter box ?

If this is the case you may want to try uncovering this box and see if the problem continues.