PHP script which give different result from Mysqli

Question

I am facing a difficulty on my project. I ran the same code in mysql and in my php code, but the result is not the same. It looks like in php my code does not consider the second clause of my php script

I run this code in mysql

SELECT SUM(`montantttc`) AS total_retard_fournisseur FROM facturefournisseur WHERE `datepaiement`<CURDATE() AND `statut`<>"Reglé"

Here is the right result in my database

total_retard_fournisseur
NULL

In my php code

include('db.php');
$numretardfour = "SELECT count(*) AS`Retard_Paiement_Fournisseur` FROM facturefournisseur WHERE `datepaiement`<CURDATE() AND (statut<>'Reglé');
$runnumretardfour=mysqli_query($con,"SELECT count(*) AS`Retard_Paiement_Fournisseur` FROM facturefournisseur WHERE `datepaiement`<CURDATE() AND (statut<>'Reglé')");
    while($row = mysqli_fetch_array($runnumretardfour)){
?>       
          <tr>
            <td><i class="fa fa-user w3-text-blue w3-large"></i></td>
            <td>Nombre de factures fournisseur en retard de paiement</td>
            <td><i><?php echo $row["Retard_Paiement_Fournisseur"]; }?> Facture(s)</i></td>
          </tr>

The result is

total_retard_fournisseur
1250

Just to share you everything, you can find my entire table.My DB

Can you help me please to solve this issue?

Thanks