Did you make changes in any other files by chance? I downloaded the login.php but I'm getting an error locally. I've check my database and it appears to be the same as the remote. Here's the error I'm getting.
SELECT person, email_address FROM login WHERE email_address = ? AND email_verified = ? AND verification_hash = ? AND password = ? AND active = ? LIMIT 1
Fatal error: Call to a member function fetch_array() on boolean in C:\xampp\htdocs\ALF\webassist\mysqli\authentication.php on line 98