Eloquent two key relationship with Product, User, and Category table with two categories only

Hi, here are my migrations files :

// users
 public function up(): void
    {
        Schema::create('users', function (Blueprint $table) {
            $table->id();
            $table->string('name');
            $table->string('email')->unique();
            $table->string('profile_image')->nullable(); 
            $table->timestamp('email_verified_at')->nullable();
            $table->string('password');
            $table->rememberToken();
            $table->timestamps();
        });
    }
// products
public function up(): void
    {
        Schema::create('products', function (Blueprint $table) {
            $table->id();
            $table->foreignIdfor(\App\Models\Category::class);
            $table->foreignIdFor(\App\Models\User::class);
            $table->string('title');
            $table->string('slug')->unique();
            $table->text('description');
            $table->string('media');
            $table->boolean('visibility')->default(false);
            $table->timestamps();
        });
    }
// categories
 public function up(): void
    {
        Schema::create('categories', function (Blueprint $table) {
            $table->id();
            $table->string('name');
            $table->string('slug')->unique();
            $table->timestamps();
        });
    }

and here are my factories files :

// users factory
 public function definition(): array
    {
        return [
            'name' => fake()->name(),
            'email' => fake()->unique()->safeEmail(),
            'profile_image' => fake()->imageUrl(50, 50),
            'email_verified_at' => now(),
            'password' => static::$password ??= Hash::make('password'),
            'remember_token' => Str::random(10),
        ];
    }
// products factory
 public function definition(): array
    {
        return [
            'title' => fake()->text(15),
            'slug' => fake()->slug(10, true),
            'user_id' => \App\Models\User::factory(),
            'category_id' => \App\Models\Category::factory(),
            'description' => fake()->text(50),
            'media' => fake()->imageUrl(150, 150),
            'visibility' => fake()->boolean(false),
        ];
    }
// categories
  public function definition(): array
    {
        return [
            'name' => fake()->randomElement(['Shoes', 'Shirts']),
            'slug' => fake()->slug(),
        ];
    }

The relationship between users and products works fine and with fake data I can do this in Tinker :

• $users = App\Models\Users::factory(10)->create(); that create 10 users.
• $products = App\Models\Product::factory()->count(20)->recycle($users)->create(); that create 20 products shared randomly between 10 users. But what I see is the products table is displayed like this :

products
+----+------------+----------------+--------------+-------------+
| id | name       | category_id | user_id | ...
+----+------------+-----------------+----------+-------------+
| 1  | Polo Z     | 1                    |         5       | ...      |
| 2  | T-sh100  | 2                    |         8       | ...      |
| 3  | Nike D     | 3                    |         4       | ...      | 
| 4  | Sport D   | 4                    |         1       | ...      |
...    ...               ...             ...   
+----+------------+-------------+-------+---------------------+ 				

and the categories table is like this :

categories
+----+------------+-------------+-------+
| id | name       | slug          |  ...
+----+------------+-------------+-------+
| 1  | Shirts       | shirts              |    
| 2  | Shoes       | shoes                 |         
+----+------------+-------------+-------+				

The category_id increment by 1, 2, 3, 4... in products table instead of alternating between id 1 or 2. What I want it is to display it like this :

products
+----+------------+-------------+-------+-------------+
| id | name       | category_id | user_id | ...
+----+------------+-------------+-------+-------------+
| 1  | Nike D      | 2               |         5       | 
| 2  | T-H100     | 1               |         8       |
| 3  | Sport R     | 2               |         4       | 
| 4  | Polo Z       | 1               |         1       |
...    ...               ...             ...   
+----+------------+-------------+-------+-------------+ 				

What I missed in my schema design?