login fill issue - save!!!

login issue - after filling the password from 1password it's asking to save the same. Why? What's happening here?

I logged in for a site. I filled through 1password. After the login it asked me to save the login, why? I have not saved but it should not ask me. This is happening for multiple sites. I'm sure you'll say the site structure has changed but then such things should get updated automatically or there should be an option to check if the login already exists and I can confirm it to be the same.