Cannot see the created database in mysql - mysql

Question

I created a database from the mysql prompt. It is named "spring_security_tutorial".
Then, I created a user named "erdinc#localhost" and granted the user all the privileges for the "spring_security_tutorial" db.
Here is the "show databases" result when I am connected as root:
mysql> show databases;
+--------------------------+
| Database |
+--------------------------+
| information_schema |
| mysql |
| performance_schema |
| spring_security_tutorial |
| springsecurity |
| test |
+--------------------------+
6 rows in set (0.00 sec)
Here is the result of the command "use spring_security_tutorial" when I am connected as root:
mysql> use spring_security_tutorial;
ERROR 1049 (42000): Unknown database 'spring_security_tutorial'
Here is the result of the command "select user(), current_user()":
mysql> select user(), current_user()
+----------------+----------------+
| user() | current_user() |
+----------------+----------------+
| root#localhost | root#localhost |
+----------------+----------------+
1 row in set (0.00 sec)
Here are the privileges of the root and erdinc users:
mysql> show grants for 'root'#'localhost';
+---------------------------------------------------------------------+
| Grants for root#localhost |
+---------------------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'root'#'localhost' WITH GRANT OPTION |
| GRANT PROXY ON ''#'' TO 'root'#'localhost' WITH GRANT OPTION |
+---------------------------------------------------------------------+
2 rows in set (0.00 sec)
mysql> show grants for 'erdinc'#'localhost';
+---------------------------------------------------------------------------------------------------------------+
| Grants for erdinc#localhost |
+---------------------------------------------------------------------------------------------------------------+
| GRANT USAGE ON *.* TO 'erdinc'#'localhost' IDENTIFIED BY PASSWORD '*8DCDD69CE7D121DE8013062AEAEB2A148910D50E' |
| GRANT ALL PRIVILEGES ON `spring_security_tutorial`.* TO 'erdinc'#'localhost' WITH GRANT OPTION |
+---------------------------------------------------------------------------------------------------------------+
2 rows in set (0.00 sec)
I cannot use the spring_security_tutorial database as root user even if I can see it with "show databases".
Also, when I am connected as "erdinc#localhost", I cannot even show the mentioned database.
It just shows the test and information_schema databases.
I am looking up for this for a couple of hours now. Actually I used to use mysql in the past, either something changed in the usage or I am missing something very obvious because this used to be a trivial task.
Thanks in advance.