Is laravel created_at and updated_at inverse?

Laravel Framework version 5.2.5

When I updated a record, update_at was not changed but created_at changed to the current timestamp.

Is this correct?

MariaDB [moon]> show columns from users;
+----------------+------------------+------+-----+---------------------+-----------------------------+
| Field          | Type             | Null | Key | Default             | Extra                       |
+----------------+------------------+------+-----+---------------------+-----------------------------+
| id             | int(10) unsigned | NO   | PRI | NULL                | auto_increment              |
| name           | varchar(255)     | NO   |     | NULL                |                             |
| email          | varchar(255)     | NO   | UNI | NULL                |                             |
| password       | varchar(60)      | NO   |     | NULL                |                             |
| remember_token | varchar(100)     | YES  |     | NULL                |                             |
| created_at     | timestamp        | NO   |     | CURRENT_TIMESTAMP   | on update CURRENT_TIMESTAMP |
| updated_at     | timestamp        | NO   |     | 0000-00-00 00:00:00 |                             |
+----------------+------------------+------+-----+---------------------+-----------------------------+

<?php

use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class CreateUsersTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('users', function (Blueprint $table) {
            $table->increments('id');
            $table->string('name');
            $table->string('email')->unique();
            $table->string('password', 60);
            $table->rememberToken();
            $table->timestamps();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::drop('users');
    }
}

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