Ajax Form validation failed

Hi !
When I submit a form in my modal using Ajax. If the submission failed, I’m redirected on the action page instead of reloaded by Ajax.

I use an advanced application, I have this problem in my backend, not in my frontend … The code is the same (controller, JS…)… I don’t understand.

Thanks for your help !

What do you have in logs and response?

I don’t see any problem in my log, request, response.

I have try to implemente the same modal form with Ajax in the SiteController and it works !
I don’t understand why the action works with SiteController and not with the others ???

Could you post ajax request source code?

Controller :

public function actionUpdateHours($id) {
    $day = Day::findOne($id);
    $hours = $day->getTimetables()
        'begin_hour' => SORT_ASC,

    if (Model::loadMultiple($hours, Yii::$app->request->post()) && Model::validateMultiple($hours)) 
        foreach ($hours as $hour) {
        return $this->redirect(['setting/index']);
    } else {
        return $this->renderAjax('update-hours', [
            'hours' => $hours,

JS :

$("#modalButton").click(function () {
    $(document).on("click", '.btn-update-hours', function () {
        var id = $(this).attr('data-id');

        $.get('index.php?r=setting%2Fupdate-hours', {'id':id}, function (data) {