PHP inserting twice?

[220061]

hello I'm trying to find out why my db inserts the same row twice., I just can't seem to find out why it does this?

<?php
  include "navbar.php";
  include "config.php";
?>
<link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous">
<section class="vh-100" style="background-color: #eee;">
  <div class="container h-100">
    <div class="row d-flex justify-content-center align-items-center h-100">
      <div class="col-lg-12 col-xl-11">
        <div class="card text-black" style="border-radius: 25px;">
          <div class="card-body p-md-5">
            <div class="row justify-content-center">
              <div class="col-md-10 col-lg-6 col-xl-5 order-2 order-lg-1">
                <p class="text-center h1 fw-bold mb-5 mx-1 mx-md-4 mt-4">Sign up</p>
                <form class="mx-1 mx-md-4" action="registerback.php" method="post">
                  <div class="d-flex flex-row align-items-center mb-4">
                    <div class="form-outline flex-fill mb-0">
                      <input type="text" id="name" class="form-control" name="name"/>
                      <label class="form-label" for="name" id="name">Your Name</label>
                    </div>
                  </div>
                  <div class="d-flex flex-row align-items-center mb-4">
                    
                    <div class="form-outline flex-fill mb-0">
                      <input type="text" id="username" class="form-control" name="username"/>
                      <label class="form-label" for="username" id="username">Your username</label>
                    </div>
                  </div>
                  <div class="d-flex flex-row align-items-center mb-4">
                    
                    <div class="form-outline flex-fill mb-0">
                      <input type="email" id="email" class="form-control" name="email"/>
                      <label class="form-label" for="email" id="email">Your Email</label>
                    </div>
                  </div>
                  <div class="d-flex flex-row align-items-center mb-4">
                    
                    <div class="form-outline flex-fill mb-0">
                      <input type="password" id="password" class="form-control" name="password"/>
                      <label class="form-label" for="password" id="password">Password</label>
                    </div>
                  </div>
                  <div class="form-check d-flex justify-content-center mb-5">
                    <input
                      class="form-check-input me-2"
                      type="checkbox"
                      value=""
                      id="form2Example3c"
                    />
                    <label class="form-check-label" for="form2Example3">
                      I agree all statements in <a href="#!">Terms of service</a>
                    </label>
                  </div>
                  <div class="d-flex justify-content-center mx-4 mb-3 mb-lg-4">
                    <button class="btn btn-primary btn-lg" type="submit">Register</button>
                  </div>
                </form>
              </div>
              <div class="col-md-10 col-lg-6 col-xl-7 d-flex align-items-center order-1 order-lg-2">
                <img src="https://mdbootstrap.com/img/Photos/new-templates/bootstrap-registration/draw1.png" class="img-fluid" alt="Sample image">
              </div>
            </div>
          </div>
        </div>
      </div>
    </div>
  </div>
</section>

backend code

<?php
session_start();
error_reporting(E_ALL);
ini_set('display_errors', 1);
// Check if the user is already logged in, if yes then redirect him to welcome page
if(isset($_POST["email"]) && $_POST["password"] === true){
    header("location: welcome.php");
    exit;
}
// Include config file
include "config.php";
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
$email = mysqli_real_escape_string($conn , $_POST['email']);
$name = mysqli_real_escape_string($conn , $_POST['name']);
$username = mysqli_real_escape_string($conn , $_POST['username']);
$password = mysqli_real_escape_string($conn , $_POST['password']);
$sql = "INSERT INTO users (email, name, password, username) VALUES (?, ?, ?, ?)";
if($stmt = $conn->prepare($sql)) { // assuming $mysqli is the connection
    $stmt->bind_param('ssss', $email, $name, $password, $username);
    $stmt->execute();
    // any additional code you need would go here.
} else {
    $error = $conn->errno . ' ' . $conn->error;
    echo $error; // 1054 Unknown column 'foo' in 'field list'
}

//schets van w3schools
// prepare and bind
// $stmt = $conn->prepare("INSERT INTO MyGuests (firstname, lastname, email) VALUES (?, ?, ?)");
// $stmt->bind_param("sss", $firstname, $lastname, $email);
if ($stmt->execute()) {
    // it worked
    header("Location: stmtsucces.php");
 } else {
    // it didn't
    header("Location: stmtfailure.php");
 }
$stmt->close();
$conn->close();
}
?>

 

[220061]

ah wait never mind I know the problem it is because when I say if($stmt->execute()) it will actually call that execute twice