php/hmtl header() not redirecting to page with id in url

Situation: I have a member database overview where the user can click on an 'update member' link in a table that redirects to a page showing the data of clicked member. In the url it gets the parameter lid.php?lidnummer=4 (of any other id).

On that page is a form that allows the user to add a phone number to that member which goes through the create.php file after pressing the submit button. This page should redirect back to the member page lid.php?lidnummer=4 with the new phone number added.

I am passing the lidnummer through a hidden form field and I try to use this in the header() function.

header("location: ../lid.php?lidnummer=' . $lidnummer . '");

Only after the redirect the url shows:

lid.php?lidnummer=%27%20.%205%20.%20%27 

and I get a 'call to a member function' error on the page, because the page displays the member data through a function that grabs the lidnummer as parameter through $_GET after pressing the 'update member' button.

<?php
if(isset($_GET['lidnummer'])) 
{ 
    include 'includes/read.php'; 
    $lidnummer = $_GET['lidnummer'];
?>
<div class="contact-form">     
    <h3>Voeg contactgegevens toe:</h3>
    <form action="includes/create.php" method="POST"><b>
        <label for="telefoonnummer">
            Telefoonnummer:
            <input type="text" name="telefoonnummer">
        </label>
        <input type='hidden' name='lidnummer' value='<?php echo $lidnummer ?>'>
        <button type="submit" name='add_telnr'>Voeg telnr toe</button>
    </form><br>
    <form action="includes/create.php" method="POST">        
        <label for="email">
            Email:
            <input type="text" name="email">
        </label>
        <button type="submit" name='add_email'>Voeg email toe</button></b>
    </form><br>
</div>

<div>
    <h3>Lid:</h3>
    <table>
        <tbody>
            <tr>
                <td>#</td>
                <td>Info</td>
                <td>Pas aan</td>
                <td>Delete</td>
            </tr>
            <?php show_single_lid($conn, $lidnummer); ?>          
        </tbody>
    </table>
</div>
<?php } ?>

So I have 2 questions:

1. How do I get the create.php file to redirect back to the lid.php page with the correct url parameter (lidnummer) after adding the phone number?
2. How (if solving 1 doesn't fix this) do I then again pass the lidnummer to the lid.php page to show the data of that member again but updated?