Не срабатывает isset (button)

            <form method="post">
            <div class="row">
                <div class="col-12">
                        <div class="wrap tape-wrap">
                            <div class="scrollbar">
                                <div class="handle">
                                    <div class="mousearea"></div>
                                </div>
                            </div>

                            <div class="frame" id="tape-scroll">
                                <div class="clearfix">
                                
                                               <?php
                                session_start(); 
                                include "configuration/db.php";
                                
                               while($row = mysqli_fetch_array($zakaz)){
                                $idi=$row['id'];
                                $name=$row['name_project'];
                                    echo '<div class="tape-wrap__col">
                                        <div class="tape__card tape__card_first">
                                            <span class="tape__card-title">Отклики на заказ:</span>
                                            <p class="tape__card-sub-title">'; echo $name; echo'</p>

                                        </div>
                                       ';
$zapr = "SELECT * FROM otkliki WHERE zakazchik='".$_SESSION['id']."' AND n_zakaza=$idi";
$queryotkl = mysqli_query($link, $zapr);
                                        while($rows = mysqli_fetch_array($queryotkl)){
                                        $id_zakaza = $rows['n_zakaza'];
                                        $comment = $rows['comment'];
                                        $time = $rows['time_otklika'];
                                        $isp = $rows['ispolnitel'];
                                        $ido = $rows['id'];
                                        echo '<div class="tape__card">
                                            <div class="tape__card_items">
                                                <span class="tape__card-data">'; echo $time; echo '</span>
                                                

                                                <p class="tape__card-title"><span class="tape__card-title_color">Отклик от </span>архитектора №
                                                    '; echo $isp; echo '</p>
                                                <p class="tape__card-info">'; echo $comment; echo '</p>';?>
                                                
                                                <?php echo '<div style="display: none">
                            <input type="text" name="commentar" value="'; echo $ido; echo'">
                                                </div>'; ?>
                                                <div class="tape__card-buttons">
                                                <button class="btn">Принять</button>
                                                <button type="submit" name="sss" class="btn">Отклонить</button>
                                                <button class="btn">Профиль</button>
                                               
                                            <?php echo '</div>
                                            </div>
                                        </div>';
                                    }
                                    echo ' </div>';
                                }
                                    ?>
                                    </div>
             <?php
                                             if(isset($_POST['sss'])){
                                    $idxe = $_POST['commentar'];
                                    $del = mysqli_query($link, "DELETE FROM otkliki WHERE id='".$idxe."'");
                                    exit("<meta http-equiv='refresh' content='0; url= /index.php'>");
                                }
                                ?>                   

                                </div>
                            </div>
                        </div>

                </div>
<!--example-->

 </form>

<script src="js/jquery-3.4.1.min.js"></script>
<script src="js/plugins.min.js"></script>
<script src="js/main.min.js"></script>
<script>

</script>

Не срабатывает if(isset($_POST['sss'])){ подскажите пожалуйста что и где упустил? :(