More then one row beeing adding to relational models

[dimpu]

I trying to follow the tutorial at https://laracasts.com/lessons/whats-new-in-testdummy by @JeffreyWay

When i have code as

$factory('App\User',[
    'name' => $faker->name,
    'email' => $faker->email,
    'password'=> bcrypt('Passw0rd')
]);

$factory('App\Post',[
    'title' => $faker->name,
        'user_id' => 'factory:App\User'
]);

and my DatabaseSeeder.php

<?php
use Illuminate\Database\Seeder;
use Illuminate\Database\Eloquent\Model;

class DatabaseSeeder extends Seeder
{
    /**
     * Run the database seeds.
     *
     * @return void
     */
    public function run()
    {
        Model::unguard();
        $this->call(PostTableSeeder::class);
        Model::reguard();
    }
}

Now the issue is in database i can see there are many users created in database.