Laravel join multiple query result

Question

when i run the following query, results are listed multiple.

there are 3 records in the table but it lists 5

$adverts = Advert::where("category_id", $category->id)
->where("adverts.created_at", "<=", Carbon::now())
->orderBy("id", "DESC")
->select('adverts.*', 'advert_countries.advert_id', 'advert_countries.country_id')
->join("advert_countries", "advert_countries.advert_id", "adverts.id")
->whereIn("advert_countries.country_id", $arr)->paginate(10);

---Fixed---

Model :

public function countries(){
    return $this->hasMany(AdvertCountry::class, 'advert_id')->orderBy('id', "DESC");
}

Controller :

$adverts = $adverts->whereHas('countries', function($q) use ($arr){
    $q->whereIn('country_id', $arr);
});