Problème de code

Bonjour, je possède un site web qui fonctionnait bien mais ma page d'inscription a un problème. Les données ne sont pas enregistrées dans la bdd, les utilisateurs ne sont donc pas redirigés sur une autre page.

Pouvez-vous m'aider ?!?

Merci

voici le code : 

<?php
require('config.php');

if (isset($_REQUEST['username'], $_REQUEST['email'], $_REQUEST['password'], $_REQUEST['tel'], $_REQUEST['sexe'])){
        // récupérer le nom d'utilisateur et supprimer les antislashes ajoutés par le formulaire
        $username = stripslashes($_REQUEST['username']);
        $username = mysqli_real_escape_string($conn, $username); 
        // récupérer l'email et supprimer les antislashes ajoutés par le formulaire
        $email = stripslashes($_REQUEST['email']);
        $email = mysqli_real_escape_string($conn, $email);
        // récupérer le mot de passe et supprimer les antislashes ajoutés par le formulaire
        $password = stripslashes($_REQUEST['password']);
        $password = mysqli_real_escape_string($conn, $password);
  
  		$sexe = stripslashes($_REQUEST['sexe']);
        $sexe = mysqli_real_escape_string($conn, $sexe);
  
  		$tel = stripslashes($_REQUEST['tel']);
		$tel = mysqli_real_escape_string($conn, $tel);
  		$cle = rand(1000000, 9999999);

  		$select = mysqli_query($conn, "SELECT * FROM users WHERE username = '".$_POST['username']."'");
  		$select2 = mysqli_query($conn, "SELECT * FROM users WHERE email = '".$_POST['email']."'");
		if(mysqli_num_rows($select)) {
          	$errorRedirect = 'pseudo';
		}else{
          if(mysqli_num_rows($select2)) {
          	$errorRedirect = 'mail';
		}else{
  			
          $query = "INSERT into `users` (username, email, type, password, confirme, cle, sexe, tel)
                      VALUES ('$username', '$email', 'user', '".hash('sha256', $password)."', '1', '$cle', '$sexe', '$tel')";
          $res = mysqli_query($conn, $query);

          if($res){
            $query2 = "INSERT into `actif` (username, actif)
                      VALUES ('$username', '0')";
            $res2 = mysqli_query($conn, $query2);
            if($res2){
              header("Location: register-suite.php?cle=".$cle);
            }
              }
            }
        }
        
}
if($errorRedirect === 'pseudo') {
  header("Location: register-error.php?error=pseudo&username=$username&mail=$email&password=$password&cle=$cle&sexe=$sexe&tel=$tel");
}
else if($errorRedirect === 'mail') {
  header("Location: register-error.php?error=mail&username=$username&mail=$email&password=$password&cle=$cle&sexe=$sexe&tel=$tel");
}
?>
<!DOCTYPE html>
<html lang="en">
  <head>
    <title></title>
    <meta property="og:title" content="" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta charset="utf-8" />
    <meta property="twitter:card" content="summary_large_image" />

    <style data-tag="reset-style-sheet">
      html {  line-height: 1.15;}body {  margin: 0;}* {  box-sizing: border-box;  border-width: 0;  border-style: solid;}p,li,ul,pre,div,h1,h2,h3,h4,h5,h6,figure,blockquote,figcaption {  margin: 0;  padding: 0;}button {  background-color: transparent;}button,input,optgroup,select,textarea {  font-family: inherit;  font-size: 100%;  line-height: 1.15;  margin: 0;}button,select {  text-transform: none;}button,[type="button"],[type="reset"],[type="submit"] {  -webkit-appearance: button;}button::-moz-focus-inner,[type="button"]::-moz-focus-inner,[type="reset"]::-moz-focus-inner,[type="submit"]::-moz-focus-inner {  border-style: none;  padding: 0;}button:-moz-focus,[type="button"]:-moz-focus,[type="reset"]:-moz-focus,[type="submit"]:-moz-focus {  outline: 1px dotted ButtonText;}a {  color: inherit;  text-decoration: inherit;}input {  padding: 2px 4px;}img {  display: block;}html { scroll-behavior: smooth  }
    </style>
    <style data-tag="default-style-sheet">
      html {
        font-family: Open Sans;
        font-size: 1rem;
      }

      body {
        font-weight: 400;
        font-style:normal;
        text-decoration: none;
        text-transform: none;
        letter-spacing: normal;
        line-height: 1.625;
        color: var(--dl-color-secondary-400);
        background-color: var(--dl-color-gray-white);

      }
    </style>
    <link
      rel="stylesheet"
      href="https://fonts.googleapis.com/css2?family=Open+Sans%3Aital%2Cwght%400%2C300%3B0%2C400%3B0%2C600%3B0%2C700%3B0%2C800%3B1%2C300%3B1%2C400%3B1%2C600%3B1%2C700%3B1%2C800&amp%3Bdisplay=swap"
      data-tag="font"
    />
    <style>
      html * {
          -webkit-font-smoothing: antialiased;
      }
      input::placeholder, textarea::placeholder {
         color: #d2d6da;
      }
    </style>
    <link rel="stylesheet" href="./style.css" />
  </head>
  <body>
    <div>
      <link href="./profile.css" rel="stylesheet" />
      <link href="./home.css" rel="stylesheet" />
		      <div class="profile-container">
        <?php include('menu.php'); ?>
        <div class="profile-contact">
          <div class="profile-container09">
            <div class="profile-form">
              <h2 class="profile-text18 HeadingOne"><span>Connexion!</span></h2>
              <span class="profile-text20 Lead">
                Bienvenue !
              </span>
              <form class="profile-form1" action="" method="post">
                <label class="profile-text21 Label">Nom d'utilisateur</label>
                <input
                  type="text" name="username" required
                  placeholder="username" value="<?php echo $_GET['username']; ?>"
                  class="profile-textinput Small input"
                />
                <label class="profile-text21 Label">Adresse mail</label>
                <input
                  type="email" name="email" required
                  placeholder="email" value="<?php echo $_GET['mail']; ?>"
                  class="profile-textinput Small input"
                />
                <label class="profile-text21 Label">Numéro de téléphone</label>
                <input
                  type="tel" name="tel" required
                  placeholder="téléphone" value="<?php echo $_GET['tel']; ?>"
                  class="profile-textinput Small input"
                />
                <label class="profile-text22 Label">Mot de passe</label>
                <input
                  type="password" name="password" required
                  placeholder="mot de passe" value="<?php echo $_GET['password']; ?>"
                  class="profile-textinput1 Small input"
                />
                <label class="profile-text22 Label">Sexe</label>
                <div class="">
                  <select class="profile-textinput1 Small input" name="sexe" id="sexe" required >
                    <option value="">Votre sexe</option>
                    <option value="homme">homme</option>
                    <option value="femme">femme</option>
                    <option value="non binaire">non binaire</option>
                  </select>
                </div>
                <label class="profile-text22 Label">Conditions d'utilisation</label>
                <p><input
                  type="checkbox" required
                  class=""
                       />  En vous inscrivant, vous accepter les <a href="privacy.php" target="_blank"><i>conditions d'utilisations</i></a></p>
              <div class="profile-container10">
                <div class="profile-container11">
                  <div class="primary-blue-button-container">
                    <button type="submit"
                      class="primary-blue-button-button button ButtonSmall"
                    >
                      <span>S'inscrire</span>
                    </button>
                  </div>
                </div>
              </div>
              </form>
            </div>
            <div class="profile-info">
              <div class="profile-container12">
                <h3 class="HeadingTwo">
                  <span>Informations</span>
                  <span>pour l'inscription</span>
                </h3>
                <span class="profile-text27">
                  Remplissez le formulaire pour vous inscrire. Une fois inscris vous devrez attendre l'autorisation de l'administrateur pour avoir accès au site. <br>Merci de votre compréhension. 
                </span>
                <div class="profile-container13">
                  <div class="profile-container15">
                  </div>
                </div>
			</div>
              <div class="profile-container18"></div>
            </div>
          </div>
        </div>
        <footer class="footer-footer">
          <div class="footer-container">
            <div class="footer-container1">
              <span>Copyright © 2023 by Oakthunder</span>
            </div>
              <div class="footer-container4">
                <span class="footer-text07 Large">Login</span>
                <span class="footer-text08 Large">Register</span>
                <span class="footer-text09 Large">About</span>
              </div>
            </div>
          <img
            alt="image"
            src="public/playground_assets/waves-white.svg"
            class="footer-image"
          />
        </footer>
      </div>
    </div>
    <script src="https://unpkg.com/@teleporthq/teleport-custom-scripts"></script>
  </body>
</html>

Windows / Chrome 112.0.0.0