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.