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Password managers can also have a "go & fill" option that opens a new tab with the applicable URL, fills the login credentials, and submits. Even without specifically tracking how fast a password is entered into the password field, a website could trigger for all instances when a user manages to log in within 1 second of the first request.

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Interesting: So does Chrome. Sometimes. I've never tracked down what causes it to do this, but there's at least one site I use it with where it clicks "submit" (or some moral equivalent) on its own when filling out the login page.

Probably something the website opted into. No clue.

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