sign in bug

After leaving the site (closing the tab), he was kicked out of the admin panel. I log in and the error appears: “Invalid username and password. Please try again later." I'm trying again. Also a mistake. Same. I searched on the Internet, they write the same thing as me. They say he took the password and administrator account from the database after inactivity. I am changing the password via the phpmyadmin web interface. And nothing helped. I had to reinstall again