Laravel关系结果无法获取相同的外键

My table looks like below,

donation_requests
---------------------------------------------------------------
| id    name    donation_type_id    donation_request_type_id
|--------------------------------------------------------------
| 1     xyz     1                   3
| 2     pqr     3                   2
| 3     abc     3                   1
| 4     klm     4                   1


donation_types
------------------------
| id    name
-----------------------
| 1     jakat
| 2     sadka
| 3     lillah
| 4     fitra


donation_request_types
------------------------
| id    name
-----------------------
| 1     widow
| 2     masjid
| 3     madresha

i want donation_request data with donation_types name and donation_request_types name In my DonationRequest model code is as below

public function donation_types()
{
    return $this->belongsTo('App\DonationType','id','donation_type_id');
}

public function donation_request_types()
{
    return $this->belongsTo('App\DonationRequestType','id','donation_request_type_id');
}

but in first two row i get proper result but for third row has same donation_type_id as 3 so it give blank and same as in donation_request_type_id

tinker screenshot

As per my above question relationship is working fine, and it has issue in laravel tinker. While testing in postman i found perfect result, but in tinker there will be some issue. Update tinker but still have same problem.

public function donation_types()
{
    return $this->belongsTo('App\DonationType');
}

public function donation_request_types()
{
    return $this->belongsTo('App\DonationRequestType');
}