Formular - Dropdown ( Select Field ) in php Site

Hi Guys, i want to create a dropdown field in a formual via php. the dropdown works ( all options in the select are created normal ).

by submitting all the field to another site i receive all fields respectively all values of the fields of the formular exept the value of the dropdown field...and i don't know why.

Script of Dropdown:

       echo("

<div class='modal fade' id='exampleModalLongSC".$KitchConfigID."' tabindex='-1' role='dialog' aria-labelledby='exampleModalLongTitleSC".$KitchConfigID."' aria-hidden='true' style='display: none;'>

  <div class='modal-dialog modal-dialog-scrollable' role='document'>

    <div class='modal-content'>
        <form id='contact-form".$KitchConfigID."' name='contact-form".$KitchConfigID."' action='_pages/_kitchenconfig/adm_saveKitchConfig.php?Nav=".$NavHash."&kcid=".$KitchConfigID."' method='POST'>

        <div class='modal-header'>
            <h5 class='modal-title' id='exampleModalLongTitleSC".$KitchConfigID."'>
            <b>".$KitchConfig."</b>
            </h5>
            <button form='contact-form".$KitchConfigID."'type='button' class='close' data-dismiss='modal' aria-label='Close'>
              <span aria-hidden='true'>×</span>
            </button>
        </div>

      <div class='modal-body'>
            <div class='row'>

                <div class='col-sm-12'>
                    <div class='md-form mb-0 form-sm'>
                        <input value='".$KitchConfig."' type='text' id='configname".$KitchConfigID."' name='configname".$KitchConfigID ."' class='form-control'>
                        <label for='configname".$KitchConfigID ."' class=''>Config Name:</label>
                    </div>
                </div>

            </div>

            <div class='row'>
                <div class='col-sm-12'>
                    <div class='md-form mb-0 form-sm'>
                        <select id='designer".$KitchConfigID."' name='designer".$KitchConfigID."' class='mdb-select md-form' searchable='Search here..'>");
                            $designersql = "SELECT * FROM `tbl_contacts` ORDER BY `FirstName`";
                            $resultdesigner = $conn->query($designersql);
                            if ($resultdesigner->num_rows > 0) {
                                $resultdesigner->MoveFirst;
                                while($rowdesigner = $resultdesigner->fetch_assoc()) {
                                    $DesignerName = $rowdesigner["FirstName"]." ".$rowdesigner["LastName"];
                                    $DesignerID = $rowdesigner["ContactID"];
                                    if($rowdesigner["ContactID"]==$rowkitch["Designer"]){
                                            echo("<option value='designer' selected='selected'>".$DesignerName."</option>");
                                        }
                                        else {
                                            echo("<option value='designer'>".$DesignerName."</option>");
                                        }
                                }
                            }
         echo("</select>
                        <label for='designer".$KitchConfigID."' class=''>Designer:</label>
                    </div>
                </div>
            </div>


            <div class='row'>

                <div class='col-lg-12'>
                    <div class='md-form mb-0 form-sm'>
                        <input value='".$KitchReason."' type='text' id='reason".$KitchConfigID."' name='reason".$KitchConfigID."' class='form-control'>
                        <label for='reason".$KitchConfigID."' class=''>Reason:</label>
                    </div>
                </div>

            </div>


            <div class='row'>

                <div class='col-lg-12'>
                    <div class='md-form mb-0 form-sm'>
                      <textarea type='text' id='keynote".$KitchConfigID."' name='keynote".$KitchConfigID."' class='md-textarea form-control'>".$KitchKeyNote."</textarea>
                        <label for='keynote".$KitchConfigID."' class=''>Key Note:</label>
                    </div>
                </div>


            </div>


            <div class='row'>

                <div class='col-lg-12'>
                    <div class='md-form mb-0 form-sm'>
                      <textarea type='text' id='comment".$KitchConfigID."' name='comment".$KitchConfigID."' class='md-textarea form-control'>".$KitchComment."</textarea>
                        <label for='comment".$KitchConfigID."' class=''>Comment:</label>
                    </div>
                </div>

            </div>
            <br>     
            <div class='row'>
                <div class='custom-control custom-checkbox custom-control-inline'>
                    ".$KitchStdDetail."
                    <label class='form-check-label' for='stdchkbox".$KitchConfigID."'>Standard</label>
                </div>
                <div class='custom-control custom-checkbox custom-control-inline'>
                      ".$KitchActDetail."
                      <label class='form-check-label' for='activchkbox".$KitchConfigID."'>Activ</label>
                </div>
            </div>
        </div>

      <div class='modal-footer'>
        <div class='container col-sm-12'>
            <div class='md-form mb-0 float-left'>
                <small><small> Created: ".$KitchCreatedBy."&nbsp;&nbsp;(&nbsp;".$KitchCreatedDate."&nbsp)
                <br/>
                Last Edit: ".$KitchLastEditBy."&nbsp;&nbsp;( ".$KitchLastEditDate."&nbsp)
                </small></small>
            </div>
            <div class='md-form mb-0 float-right'>
                <button type='submit' class='btn btn-outline-danger waves-effect btn-sm float-right'>Save <i class='fas fa-magic ml-1'></i></button>
            </div>
        </div>
      </div>

    </form>
    </div>

  </div>

");

on the forwarded Site: all Values could be requested via $_Post ... only the select field is empty ( By the way...also the checkbox is empty in case that the checkbox is not checked ) ... maybe you also have an Idea for that.

The code on that page is:

    <?php
include('../../_admins/db_connection.php');
$NavHash = $_GET["Nav"];
$upd_KitchConfigID = $_GET["kcid"];
$upd_KitchConfig = $_POST["configname$upd_KitchConfigID"];
$upd_KitchConfigDesigner = $_POST["designer$upd_KitchConfigID"];
$upd_KitchConfigReason = $_POST["reason$upd_KitchConfigID"];
$upd_KitchConfigKeyNote = $_POST["keynote$upd_KitchConfigID"];
$upd_KitchConfigComment = $_POST["comment$upd_KitchConfigID"];
$upd_KitchConfigStandard = $_POST["stdchkbox$upd_KitchConfigID"];
$upd_KitchConfigActiv = $_POST["activchkbox$upd_KitchConfigID"];

echo("upd_KitchConfigID: <b>".$upd_KitchConfigID."</b><br>");
echo("upd_KitchConfig: <b>".$upd_KitchConfig."</b><br>");
echo("upd_KitchConfigDesigner: <b>".$upd_KitchConfigDesigner."</b><br>");
echo("upd_KitchConfigReason: <b>".$upd_KitchConfigReason."</b><br>");
echo("upd_KitchConfigKeyNote: <b>".$upd_KitchConfigKeyNote."</b><br>");
echo("upd_KitchConfigComment: <b>".$upd_KitchConfigComment."</b><br>");
echo("upd_KitchConfigStandard: <b>".$upd_KitchConfigStandard."</b><br>");
echo("upd_KitchConfigActiv: <b>".$upd_KitchConfigActiv."</b><br><br>");
echo("NavHash: <b>".$NavHash."</b><br>");

?>

I receive an Notice on that page: "Undefined index: desinger2 in ...." This notice i receive for the dropdown field and the checkbox

i hope you can help me in that case?!!!

thnx so much in advance. BR, Max

PS: Sorry...i'm a newby ( so the code seems not that professional )