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I’m sorry you’re having this problem. I know how tiring it gets wiping it up and contending with the smell. We have 2 males who were peeing out of the box for years. One even jumped up on my lap and peed one time. So I think with our males it’s more a territorial issue. One of them did have crystals years ago and so he’s been monitored since then so it’s not that. I would start with having them checked for crystals or a infection.
Could it be the litter boxes are beginning to frighten them? I’ve heard of others having issues with them so that’s why I asked. And although experts advise 1 box for each cat and 1 or 2 extra but with your 10, that could be a problem for you and get very expensive with litter. But maybe trying at least 2 or 3 more regular boxes and areas that the girls spend the most time, may help out. I’m sure you’ve heard that using vinegar to clean with is a big no no. A good bacterial agent will help with the smell and help prevent them from returning. It’s several months later now so I’m hoping you got it worked out. If not, keep posting and I’m sure people on here will try their best with suggestions.
Janet