Problem with DateRangePicker

I wanted to use DatePickerRange from here http://demos.krajee.com/date-range#usage on my website and this is my code:


<?php


use yii\helpers\Html;

use yii\grid\GridView;

use kartik\daterange\DateRangePicker;

use kartik\widgets\ActiveForm;




/* @var $this yii\web\View */

/* @var $searchModel backend\models\PoleceniSearch */

/* @var $dataProvider yii\data\ActiveDataProvider */


$this->title = 'Polecający - kalendarz';

$this->params['breadcrumbs'][] = $this->title;

?>

<div class="poleceni-index">


    <h1><?= Html::encode($this->title) ?></h1>

    <?php // echo $this->render('_search', ['model' => $searchModel]); ?>


    <p>

        <?= Html::a('Dodaj polecenie', ['create'], ['class' => 'btn btn-success']) ?>

    </p>


    <?= GridView::widget([

        'dataProvider' => $dataProvider,

        'filterModel' => $searchModel,

        'columns' => [

            ['class' => 'yii\grid\SerialColumn'],


            //'id',

            [

			'attribute' => 'kto',

			'value' => 'kto.username',

			],

			[

			'attribute' => 'komu',

			'value' => 'komu.username',

			],

			[

			'attribute' => 'data',

			'value' => 'data',

			'filter' => DateRangePicker::widget([

			'model' => $searchModel,

			'name'=>'date_range_2',

			'presetDropdown'=>true,

			'hideInput'=>true

]),

],


            ['class' => 'yii\grid\ActionColumn'],

        ],

    ]); ?>


</div>



Displays good, but when I type a date - it does not remember the date. This appears briefly and immediately disappears

What am I doing wrong?