Safari: macOS browser now auto submits logins. Here’s how to disable it
Apple changed the behavior of Safari in macOS 10.14.4, and you may have noticed it and thought it was a bug. Now, if you have stored a password for a website, when you select a login entry to autofill, Safari 12.1 for macOS automatically submits the login. Previously, it would fill the fields and still require you to click a Login or Submit or other button to proceed.