Why does my widget work in layout files but not in view files?

I have a widget which works perfectly fine when I use it in layout files however as soon as I use it outside of a layout files say in my index view it displays but when the form is submitted no validation is done and I just get redirected to /index even thought the form action isn’t even set to /index.

Below is my code

Widget (common/widgets/NewsletterWidget.php)

<?php

namespace common\widgets;


use yii\base\Widget;

use frontend\models\Newsletter;

use yii\data\ActiveDataProvider;

use Yii;


/**

 * TestWidget

 */

class NewsletterWidget extends Widget

{


    public function run()

    {

		$model = new Newsletter();


        return $this->render('newsletterform', [

		'model' => $model

		]);

    }

}

View (common/widgets/views/NewsletterForm.php)

<?php

use yii\helpers\Html;

use yii\bootstrap\ActiveForm;


?>

<?php $form = ActiveForm::begin(['action' => '/newsletter/newslettersignup',]); ?>

	

	<?= $form->field($model, 'email')->textInput(array('placeholder' => 'Enter Email Address'))->label(false) ?>


	<div class="form-group field-newsletter-buttom">

    	<?= Html::submitButton(Yii::t('app', 'Join Now'), ['class' => 'newsletter-btn', 'name' => 'subscribe-button']) ?>

    </div>


<?php ActiveForm::end(); ?>

C