Repeater Component only showing one record despite HasMany relationship

Hi Guys!
I have a question regarding the repeater component that has a relationship. The way I have it setup, "works" but its only showing one entry(the last one), and not all the entries.

So I have a repeater in my waybillResource:

$repeaterField = Repeater::make('CONTENTS')
        ->schema([
            TextInput::make('DESCRIPTION')->label('Desc')->required(),
            TextInput::make('DIM1')->label('Dim1')->required(),
            TextInput::make('DIM2')->label('Dim2')->required(),
            TextInput::make('DIM3')->label('Dim3')->required(),
            TextInput::make('ACTMASS')->label('Weight')->required(),
        ])
        ->relationship('CONTENTS')
        ->defaultItems(0)
        ->columnSpanFull()
        ->columns(5);

$repeaterField = Repeater::make('CONTENTS')
        ->schema([
            TextInput::make('DESCRIPTION')->label('Desc')->required(),
            TextInput::make('DIM1')->label('Dim1')->required(),
            TextInput::make('DIM2')->label('Dim2')->required(),
            TextInput::make('DIM3')->label('Dim3')->required(),
            TextInput::make('ACTMASS')->label('Weight')->required(),
        ])
        ->relationship('CONTENTS')
        ->defaultItems(0)
        ->columnSpanFull()
        ->columns(5);

In my waybill model:

public function CONTENTS(): HasMany
    {      
        return $this->HasMany(Contents::class, 'WAYBILL'); 
    }

public function CONTENTS(): HasMany
    {      
        return $this->HasMany(Contents::class, 'WAYBILL'); 
    }

And in my contents model:

public function WAYBILL(): BelongsTo
 {      
    return $this->BelongsTo(Waybill::class, 'WAYBILL'); 
 }

public function WAYBILL(): BelongsTo
 {      
    return $this->BelongsTo(Waybill::class, 'WAYBILL'); 
 }

It looks like both records are getting fetched, since if I dump the data in the beforeFill() method, I can see 2 records present:

protected function beforeFill(): void
{
    $items = $this->record->contents->toArray();
    dd('beforeFill', $this->record, $items[0], $items[1]);
}

protected function beforeFill(): void
{
    $items = $this->record->contents->toArray();
    dd('beforeFill', $this->record, $items[0], $items[1]);
}

Am I missing something obvious here? How do I get both records to show up in the repeater?
Any help would be greatly appreciated!