PHP - Duplicate Content In Database!

<?php   
    require '../db.php';
    $paypalmode     =   '.sandbox';        
    $req = 'cmd=' . urlencode('_notify-validate');
    foreach ($_POST as $key => $value) {
        $value = urlencode(stripslashes($value));
        $req .= "&$key=$value";
    }
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, 'https://www'.$paypalmode.'.paypal.com/cgi-bin/webscr');
    curl_setopt($ch, CURLOPT_HEADER, 0);
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $req);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 1);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
    curl_setopt($ch, CURLOPT_HTTPHEADER, array('Host: www'.$paypalmode.'.paypal.com'));
    $res = curl_exec($ch);
    curl_close($ch);

    if (strcmp ($res, "VERIFIED") == 0)
    {
        $transaction_id = $_POST['txn_id'];
        $payerid = $_POST['payer_id'];
        $firstname = $_POST['first_name'];
        $lastname = $_POST['last_name'];
        $payeremail = $_POST['payer_email'];
        $paymentdate = $_POST['payment_date'];
        $paymentstatus = $_POST['payment_status'];
        $mdate= date('Y-m-d h:i:s',strtotime($paymentdate));
        $otherstuff = json_encode($_POST);
        $date = date("y-m-d");
        
            $q = $pdo->connect()->query("INSERT INTO payment (mid,username,amount,paypal_id,txn_id,received_date)   VALUES('{$_SESSION['user_id']}','{$_SESSION['uname']}','{$_POST['mc_gross']}','{$_POST['payer_email']}','{$_POST['txn_id']}','$date')");
            $q->execute();
            $q1 = $pdo->connect()->query("UPDATE members SET amount_loaded = amount_loaded + {$_SESSION['amount']} WHERE mid = '{$_SESSION['user_id']}'");
            $q1->execute();
            //header("Location: funds.php");
            echo "verified";
        
        
}



?>

$data = array();
if (($handle = fopen("stock.csv", "r")) !== FALSE) {
while (($row = fgetcsv($handle, 1000, ",")) !== FALSE) {
// only add rows to the array where the 4th column value is greater than or equal to 10
if(($row[3] >= 10 && $row[4] >= 5) OR ($row[3] >= 0 AND $row[4] > 5)){
if($row[4] < 1000){
$data[] = $row;
}
}
}


foreach ($data as &$value) {


mysql_query("INSERT INTO tblProductData 
(intProductDataId, strProductCode, strProductName, strProductDesc, strProductStock, strProductCost, dtmDiscontinued, dtmAdded, stmTimestamp) 
VALUES(null, '$data[0]', '$data[1]', '$data[2]', '$data[3]', '$data[4]', 'time', 'added', 'time') ") 
or die(mysql_error());  


}
}

<?php
require_once('init.php');

$results = $db->prepare('SELECT file_location, file_type, file_size, id as media_id WHERE id = ? LIMIT 1;');
$results->execute(array($_GET['id']));

while ($row = $results->fetch()) {

	header('Content-Type: ' . $row['file_type']);
	header('Content-Length: ' . $row['file_size']);

	$media_ins = $db->prepare('UPDATE media SET total_clicks = total_clicks + 1 WHERE id = ?');
	$media_ins->execute(array($row['id']));
        readfile($row['file_location']);

}

I've been working on developing a CMS blog and now I'm trying to create a slideshow wit Bootstrap Carousel on the homepage to present the dynamic content (images + text) using the data from table 'posts'.

I tested this code, and it only presents one post. I mean, It's not possible to go to the next slide. I want to show all the posts on the slides.

*The DB connection is already on the includes. The connection was written on a small file called DB.php

Home.php

<header>
          <div id="carouselExampleIndicators" class="carousel slide" data-ride="carousel">
                  <ol class="carousel-indicators">
                    <li data-target="#carouselExampleIndicators" data-slide-to="0" class="active"></li>
                    <li data-target="#carouselExampleIndicators" data-slide-to="1"></li>
                    <li data-target="#carouselExampleIndicators" data-slide-to="2"></li>
                  </ol>
                  <div class="carousel-inner" role="listbox">
              <?php
              // The default SQL query
                  $sql = "SELECT * FROM posts ORDER BY id desc";
                  $stmt = $ConnectingDB->query($sql);
                    while ($DataRows = $stmt->fetch()) {
                      $Id = $DataRows["id"];
                      $PostTitle = $DataRows["title"];
                      $Image = $DataRows["image"];
                      $PostText = $DataRows["post"];
              ?>
                    <!-- Slide -->
                    <div class="carousel-item active" style="background-image: url('uploads/<?php echo $Image; ?>')">
                      <div class="carousel-caption">
                        <div class="card-body black">
                          <h3 class="large-mistral-white"><?php echo $PostTitle; ?></h3>
                          <p class="small-times-white"><?php echo $PostText; ?></p>
                        </div>
                      </div>
                    </div>
                    <?php } ?>
                  </div>
                  <a class="carousel-control-prev" href="#carouselExampleIndicators" role="button" data-slide="prev">
                    <span class="carousel-control-prev-icon" aria-hidden="true"></span>
                    <span class="sr-only">Previous</span>
                  </a>
                  <a class="carousel-control-next" href="#carouselExampleIndicators" role="button" data-slide="next">
                    <span class="carousel-control-next-icon" aria-hidden="true"></span>
                    <span class="sr-only">Next</span>
                  </a>
                </div>
        </header>

DB.php

<?php

$DSN='mysql:host = localhost; dbname=everybody_blog';
$ConnectingDB = new PDO($DSN,'root','');
?>