How to solve modal window and form issue in Yii2?

Question

Yii

I have two modal windows on my page. Both with form. For some reason, in the first modal window, the form tags are displayed normally in the browser. But in the second there are no form tags. What could be the problem?

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<?
Modal::begin([
    'header' => '<h4>Добавление медикаментов</h4>',
    'options' => [
        'id' => 'modal_medikaments',
        'tabindex' => false // important for Select2 to work properly
    ],
    'footer' =>Html::submitButton('Сохранить', ['class' => 'btn btn-primary']),
]);

echo Html::beginForm(['/operation/addmedikaments?id='.$_GET['id']],'get',['name'=>'add_medikaments']);
Html::endForm();
Modal::end();

?>


Вот второе:
<?
Modal::begin([
    'header' => '<h4>Добавление услуги</h4>',
    'options' => [
        'id' => 'modal_med_usluga',
        'tabindex' => false // important for Select2 to work properly
    ],
    'footer' =>Html::submitButton('Сохранить', ['class' => 'btn btn-primary']),
]);
echo Html::beginForm(['/operation/addmed_uslugi?id='.$_GET['id']],'post',['name'=>'add_med_usluga1'], ['enctype' => 'multipart/form-data']);

Html::endForm();
Modal::end();

?>

<?php
$js = <<< JS
$('#add_med_usluga').click(function() {
    $('#modal_med_usluga').modal('show');
  
});

$('#add_medicaments').click(function() {
    $('#modal_medikaments').modal('show');
  
});

JS;
$this->registerJs( $js, $position = yii\web\View::POS_READY, $key = null );
?>​