When you press on the input page goes up

When you click on input (submit) and submit the form, the page reloads and returns to its original position. Is there any way to do this so that the position of the page remains in place after the reload?

session_start(); if ($_POST["info"]) { $error = array(); $name_user = clear_str($_POST["name_user"]); if (!$name_user) $error[] = "Укажите имя"; $log=$pdo->query("SELECT id_us FROM users WHERE login='{$name_user}'"); $log ->setFetchMode(PDO::FETCH_ASSOC); $mes_log=$log->fetch(); $log = "SELECT id_us FROM users WHERE login='%s'"; if(empty($finsch)) {$finsch=1;}; $logos = sprintf($logos,mysql_real_escape_string($name_user)); $logren =$pdo->query($logres); if ($logren->rowCount() > 0) $error[] = "Вы уже ессть в списке"; if (count($error)) { $_SESSION['message'] = "<div class='warn_reg'><p id='form-error'>".implode('<br />',$error)."</p></div>"; }else { $nam = htmlspecialchars ($_POST['name_user'], ENT_QUOTES); $f1 = htmlspecialchars ($_POST['radio'], ENT_QUOTES); $pdo->query("INSERT INTO users(logus, mailus) VALUES('$nam', '$f1')"); $count_res2 = $pdo->query("SELECT COUNT(*) as count FROM users")->fetchColumn(); $views3 = $count_res2; $_SESSION['message'] = "<div><p style='color:#009219'>Успешно</p></div>"; } header("Location:http://mysite.com/index"); exit(); } 

 <form method="post" id="contactform"> <div class="user"> <div class="login"> <div class="namest">Укажите имя</div> <input class="send_txt" type='text' name='name_user' value=""> </div> </div> <div class="socialsend"> <h2>Выберите SOC</h2> <div class="socbutt"> <label class="container1">Soc1 <input type="radio" checked="checked" name="radio" value="soc1"> <span class="checkmark"></span> </label> <label class="container1">SOC2 <input type="radio" name="radio" value="soc2"> <span class="checkmark"></span> </label> </div> </div> <div class="send_my"> <input class='button' name='info' value='Отправить'> </div> </form>