Something is wrong with timezone on mariadb

I am having an issue about the time displayed on a table.

In mariadb, I created a table that has id, name ,gender, created_at and updated_at. The table looks like this

+----+--------+--------+------+---------------------+---------------------+
|  1 | Taro   | m      |   20 | 2021-08-16 17:52:23 | 2021-08-16 17:52:23 |
|  2 | john   | m      |   18 | 2021-08-16 17:52:23 | 2021-08-16 17:52:23 |
|  3 | paul   | m      |   20 | 2021-08-16 17:52:23 | 2021-08-16 17:52:23 |
|  4 | alice  | f      |   15 | 2021-08-16 17:52:23 | 2021-08-16 17:52:23 |
|  5 | dabid  | m      |   17 | 2021-08-16 17:52:23 | 2021-08-16 17:52:23 |
|  6 | jasmin | f      |   17 | 2021-08-16 17:52:23 | 2021-08-16 17:52:23 |
|  7 | jiro   | m      |   30 | 2021-08-16 09:22:53 | 2021-08-16 09:22:53 |
+----+--------+--------+------+---------------------+---------------------+

The last two columns created_at and updated_at were created after adding the first six rows. I added the seventh row at last; however, it somehow says it created first. I added it with ruby module 'ActiveRecord'. A source code looks like this.

require 'active_record'
ActiveRecord::Base.establish_connection(
  adapter: "mysql2",
  host: "localhost",
  username: "admin",
  password: "-----",
  database: "training",
  charset: "utf8mb4", 
  encoding: "utf8mb4",
)

class User < ActiveRecord::Base
  self.table_name = 'users'
end

User.create(name: "jiro", gender: "m", age:"30")

As I live in Tokyo, I assumed that it is happening due to timezone setting. So I typed the following command to see timezone setting on Mariadb.

MariaDB [(none)]> show variables like '%time_zone%';
+------------------+--------+
| Variable_name    | Value  |
+------------------+--------+
| system_time_zone | JST    |
| time_zone        | SYSTEM |
+------------------+--------+

I also checked what timezone a system uses with this command and it returns this...

$ date
Tue Aug 17 13:20:42 JST 2021

I want created_at and updated_at to be jst. How do I fix this issue?

Environment Ubuntu 18.04 WSL1 MariaDB 10.6