при нажатии на кнопку с type submit страница не обновлялась если пароли не совпадают

<?php
    session_start();
?>


<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="css/style.min.css">
    <link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-eOJMYsd53ii+scO/bJGFsiCZc+5NDVN2yr8+0RDqr0Ql0h+rP48ckxlpbzKgwra6" crossorigin="anonymous">
    
</head>
<body>


    <div class="container">
            <h1>Регистрация</h1>
            <form action="reg.php" method="post">
        <div class="mb-3">
            <label for="exampleInputEmail1" class="form-label">Логин</label>
            <input type="text" class="form-control" id="exampleInputEmail1" name="login">
        </div>
        <div class="mb-3">
            <label for="exampleInputPassword1" class="form-label">Пароль</label>
            <input type="password" class="form-control" id="exampleInputPassword1" name="password">
        </div>
        <div class="mb-3">
            <label for="exampleInputPassword2" class="form-label">Повторите пароль</label>
            <input type="password" class="form-control" id="exampleInputPassword2" name="passwordConfirm">
        </div>
        <div class="mb-3 form-check">
            <input type="checkbox" class="form-check-input" id="exampleCheck1">
            <label class="form-check-label" for="exampleCheck1">Запомнить</label>
        </div>
        <button type="submit" class="btn btn-primary">Зарегистрироваться</button>
            <br>
            <p>
                <?php
                    echo $_SESSION['msg'];
                    unset($_SESSION['msg']);
                 ?>
            </p>
        </form>
    </div>
        





    <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
</body>
</html>
<?php

    session_start();

    require_once 'connect.php';

    $login = $_POST['login'];
    $password = $_POST['password'];
    $passwordConfirm = $_POST['passwordConfirm'];

    if($password === $passwordConfirm){
        $query = "INSERT INTO `users` (`login`, `password`, `password__confirm`) VALUES (:login, :password, :password__confirm)";
    $params = [
        ':login' => $login,
        ':password' => $password,
        ':password__confirm' => $passwordConfirm
        
    ];

    $stmt = $db->prepare($query);
    $stmt->execute($params);


    header("Location: lc.php");
    }
    else{
        $_SESSION['msg'] = "Пароли не совпадают";
        header("Location: index.php");
    };

    

?>

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