Trouble getting hasManyThrough to work in Laravel 9 - php

Question

In my Laravel project I'm having some trouble getting my hasManyThrough relationship to work, these are my models:
Pingtree
BuyerTier
PingtreeEntry
I want to get all of my BuyerTier models through my PingtreeEntry model.
This is my current relationship on my Pingtree model:
<?php
namespace App\Models;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\SoftDeletes;
class Pingtree extends Model
{
use HasFactory, SoftDeletes;
/**
* The table associated with the model.
*
* #var string
*/
protected $table = 'pingtrees';
/**
* The attributes that should be cast.
*
* #var array<string, string>
*/
protected $casts = [
'is_enabled' => 'boolean',
];
/**
* The accessors to append to the model's array form.
*
* #var array
*/
protected $appends = [
'is_deleting',
];
/**
* Determine if we're editing the model
*
* #return bool
*/
public function getIsDeletingAttribute()
{
return false;
}
/**
* Get the company that owns the model.
*/
public function tiers()
{
return $this->hasManyThrough(
BuyerTier::class, // final model we want to access
PingtreeEntry::class, // intermediate model
'buyer_tier_id', // foreign key on intermediate model
'id', // foreign key on final model
'id', // local key
'pingtree_id' // local key on intermediate model
)->orderBy('processing_order', 'asc');
}
/**
* Get the pingtree entry model
*/
public function pingtree_entry()
{
return $this->belongsTo(PingtreeEntry::class, 'id', 'pingtree_id');
}
/**
* Get the company that owns the model.
*/
public function company()
{
return $this->belongsTo(Company::class);
}
/**
* Get the user that owns the model.
*/
public function user()
{
return $this->belongsTo(User::class);
}
}
And then I query this in my controller:
$pingtree = Pingtree::where('company_id', $company_id)
->where('id', $id)
->with([
'tiers.buyer',
'tiers.pingtree_entry'
])
->first();
This is what my pingtree_entries table looks like:
Right now, for some reason, despite having multiple tiers on my pingtree ID 3, I'm only ever getting 1 result back in my query, and I should be seeing all 4 tiers on my pingtree, what am I missing?