Looking at the code for sb-login.php it seems that at login, the function nd_update_user_meta takes care of entering the latest login date into the database.
After that the form logged-in.php is loaded.
From my logic it should be the other way around. Only when logged in and dispayed the last login date, should the new date be updated.
I guess the same goes for the new comments and new posts. Right now they always show up as 0. If you are logged in and someone publishes a new post, the counter will go to 1. But if you login, the counter will always be 0.