Why does my cat poop in the bathroom sink and not the litterbox?

I have a female cat that is 5 years old and recently she poops in my bathroom sink. She is litterbox trained and I have had no previous potty issues with her before. The litterbox is also cleaned quite often. She does share it with a male cat, however; but am not sure if that is the problem or not. Is it common for a cat to look for another place to do their business? Any advice would be super, thanks!

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