Getting an input - php

Question

I have to make a website that will rank project si I've decided to use star ranking system. All works well until I add a new project.
The problem is when I rate the second project my code think it is the first one that he need to rate.
When I get all the websites with PHP, the numbers are good (input type text to see the number)
What I see on the index
But when I click on the star below the number 51, the output of the echo is 53.
Gets all the websites :
try
{
$stmt = $db->query('SELECT sites.id, sites.programme, ROUND(AVG(rating.rating_number), 2) AS rating_number, sites.annee, sites.titre, sites.equipe, sites.image_preview, sites.lien, sites.campus, sites.date_send FROM sites
INNER JOIN rating
WHERE sites.id = rating.post_id
GROUP BY sites.id
ORDER BY ROUND(AVG(rating.rating_number), 2) DESC LIMIT 30');
while($row = $stmt->fetch())
{
$date_envoie_site = strtotime($row['date_send']);
$date_maintenant = strtotime("now");
$calcul = $date_maintenant - $date_envoie_site;
echo '<div class="col custom-card">';
echo '<div class="card shadow-6-strong h-100">';
echo '<img src="img/sites/' .$row["image_preview"]. '" class="card-img-top" height="320" alt=""/>';
echo '<div class="card-body">';
if ($calcul < 86400)
{
echo '<h4 class="card-title text-center"><span class="badge bg-primary">NOUVEAU</span> ' .$row["titre"]. '</h4> ';
}
else
{
echo '<h4 class="card-title text-center">' .$row["titre"]. '</h4> ';
}
echo '<hr>';
echo '<h6 class="card-title"><i class="fa-solid fa-city"></i> ' .$row["campus"]. '</h6>';
echo '<h6 class="card-title"><i class="fa-solid fa-book"></i> ' .$row["programme"]. '</h6>';
echo '<h6 class="card-title"><i class="fa-solid fa-calendar-alt"></i> ' .$row["annee"]. '</h6>';
echo '<h6 class="card-title"><i class="fa-solid fa-users"></i> ' .$row["equipe"]. '</h6>';
echo '<form method="POST">';
echo '<input type="text" name="post_id" value="'.$row['id'].'">';
echo '<div class="rating-wrap">
<div class="center">
<fieldset class="rating">
<input type="submit" id="star5" name="star5" value="5"/><label for="star5" class="full" title="Awesome"></label>
</fieldset>
</form>
</div>
<h4 id="rating-value"></h4>
</div>';
echo '<h6 class="card-title"><i class="fa-solid fa-star"></i> ' .$row["rating_number"]. '/5</h6>';
echo '</div>';
echo '<div class="card-footer text-center">';
echo '<button type="button" class="btn btn-primary btn-lg btn-block button-custom"><i class="fa-solid fa-eye"></i> Voir le site</button>';
echo '</div>';
echo '<div class="card-footer text-center">';
echo '<div class="d-flex justify-content-evenly pb-2">';
echo '<i class="fa-brands fa-facebook fa-3x"></i>';
echo '<i class="fa-brands fa-twitter fa-3x"></i>';
echo '</div>';
echo '</div>';
echo '</div>';
echo '</div>';
}
}
catch(PDOException $e) { echo $e->getMessage();}
When I click on the star
if (isset($_POST['star5']))
{
$id = $_POST['post_id'];
echo $_POST['post_id'];
/*
$sql = "INSERT INTO rating(post_id, rating_number) VALUES (:post_id, :rating_number) WHERE post_id = '$id'";
$stmt = $db->prepare($sql);
$stmt->bindParam(':post_id', $_POST['id'], PDO::PARAM_STR);
$stmt->bindParam(':rating_number', $_POST['star5'], PDO::PARAM_STR);
$stmt->execute();
$stmt->closeCursor();
*/
}