SQLite - unique constraint failed

I have a test in my aqpplication. I have the following model factory:

use App\Hand;
/*
|--------------------------------------------------------------------------
| Model Factories
|---------------?php


use App\Hand;
/*
|--------------------------------------------------------------------------
| Model Factories
|--------------------------------------------------------------------------
|
| Here you may define all of your model factories. Model factories give
| you a convenient way to create models for testing and seeding your
| database. Just tell the factory how a default model should look.
|
*/

/** @var \Illuminate\Database\Eloquent\Factory $factory */
$factory->define(App\User::class, function (Faker\Generator $faker) {
    static $password;

    return [
        'id' => $faker->unique(true)->randomNumber,
        'name' => $faker->name,
        'email' => $faker->unique()->safeEmail,
        'password' => $password ?: $password = bcrypt('secret'),
        'remember_token' => str_random(10),
    ];
});

$factory->define(App\Hand::class, function(Faker\Generator $faker) {
    return ['game_id' => function () {
        return factory('App\Game')->create()->id;
    },
      'user_id' => function() {
        return factory('App\User')->create()->id;
      }
        ];


});

$factory->define(App\Game::class, function(Faker\Generator $faker) {
    return [
        'id' => $faker->unique()->randomDigit,
        'user_id' => function() {
      return  factory('App\User')->create()->id;
    },
        'hand_id' => function() {
        return factory('App\Hand')->create()->id;
        }];
});

$factory->define(App\Card::class, function(Faker\Generator $faker) {
    $game = factory('App\Game');
    static $card_count = 0;


    });

and this test:

<?php


use App\Hand;
/*
|--------------------------------------------------------------------------
| Model Factories
|---------------?php


use App\Hand;
/*
|--------------------------------------------------------------------------
| Model Factories
|--------------------------------------------------------------------------
|
| Here you may define all of your model factories. Model factories give
| you a convenient way to create models for testing and seeding your
| database. Just tell the factory how a default model should look.
|
*/

/** @var \Illuminate\Database\Eloquent\Factory $factory */
$factory->define(App\User::class, function (Faker\Generator $faker) {
    static $password;

    return [
        'id' => $faker->unique(true)->randomNumber,
        'name' => $faker->name,
        'email' => $faker->unique()->safeEmail,
        'password' => $password ?: $password = bcrypt('secret'),
        'remember_token' => str_random(10),
    ];
});

$factory->define(App\Hand::class, function(Faker\Generator $faker) {
    return ['game_id' => function () {
        return factory('App\Game')->create()->id;
    },
      'user_id' => function() {
        return factory('App\User')->create()->id;
      }
        ];


});

$factory->define(App\Game::class, function(Faker\Generator $faker) {
    return [
        'id' => $faker->unique()->randomDigit,
        'user_id' => function() {
      return  factory('App\User')->create()->id;
    },
        'hand_id' => function() {
        return factory('App\Hand')->create()->id;
        }];
});

$factory->define(App\Card::class, function(Faker\Generator $faker) {
    $game = factory('App\Game');
    static $card_count = 0;


    });

When I run phpunit I get the following error

1) Tests\Feature\GameTest::test_both_hands_have_unique_cards Illuminate\Database\QueryException: SQLSTATE[23000]: Integrity constraint violation: 19 UNIQUE constraint failed: users.id (SQL: insert into "users" ("id", "name", "email", "password", "remember_token", "updated_at", "created_at") values (8, Reinhold Murazik PhD, bill51@example.com, $2y$10$q1JAUfI6hAT3L2xBTYjMgeqow2wKTnvIlKENuPl.77hBRObZZG45O, 6t3D4wuEyS, 2019-05-16 13:52:50, 2019-05-16 13:52:50))

I was curious if this was an issue with SQLite, so I fired up tinker and successfully created a new user record by running factory('App\User')->create. However, I still get the integrity constraint violation error in my testing environment. Why do I get the error in my SQLIte test database but not my main MySQL database