Simple repeater data passing in as string instead of array

$table->json('functions')->nullable();
$table->json('qualifications')->nullable();

Section::make()
  ->columnSpanFull()
  ->schema([
    Repeater::make('functions')
      ->label('Job Functions')
      ->addActionLabel('Add job function')
      ->simple(
        TextInput::make('function')
      ),
    ]),

Section::make()
  ->columnSpanFull()
  ->schema([
    Repeater::make('qualifications')
      ->label('Qualifications')
      ->addActionLabel('Add qualification')
      ->simple(
        TextInput::make('qualification')
      ),
    ]),

protected $casts = [
    'functions'       => 'array',
    'qualifications'  => 'array',
];

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foreach() argument must be of type array|object, string given at /var/www/html/vendor/filament/forms/src/Components/Repeater.php:783)