You might also find your answer in the LastPass Enterprise Manual.

Why is my reporting showing logins even though the user has not fully logged into the website?

If a user on your Enterprise system AutoFills a login field on a website, it is recorded as a login by reporting even if the user does not fully login.  We mark this as a login because  once a credential is AutoFilled, LastPass cannot track if the user manually submits the login button or not.  Because of this, we conside an AutoFill a login in reporting, because it effectively enables a user to do so.

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