Two saved passwords rejected when logging in to a website which my system says does not exist.

Years ago I saved two generated passwords for a website. I changed my email address and deleted a lot of saved passwords listed under the old email address. I now cannot log in to that website, saying my details are invalid, using those saved passwords which come up for it. Yet my password manager says no such saved website exists on my system, despite trying different words to find it. It even rejects the full log-in search address copied from the website.