hi OOB.
It is quite normal.
On visit 11:00, auto-login is worked.
(Session was timed-out since 10:00)
Since Auto-login means "log-in", it is natural to update "last visit".
Anyway, you can disable it quite easily.
edit include/common.php
if (false != $user && $user->getVar('level') > 0) {
// update time of last login
$user->setVar('last_login', time());
if (!$member_handler->insertUser($user, true)) {
}