In 1Password I tap the website field of a login entry. It correctly runs Safari, goes to the website's login page, fills in the login details and waits for me to tap Log In. But if I go to the website login page first, in Safari, and try to use the 1P Safari extension, the login entry is not listed.
1Password Version: 7.0.5
Extension Version: Not Provided
OS Version: iOS 11.2.2
Sync Type: Dropbox