update_post_meta not adding anything.(Nor add_post_meta)

So I have made some kind of importer(From another non WP db to my WP db) which handles everything in a click of a button.

Now it does correctly create a post type although one of the custom fields made with ACF in which I have to place the ID from the other DB is not filling in correctly and I did this according to update_post_meta. Now I have no idea what the issue is because when I look into my WordPress DB it shows that it adds it correctly into the database but it does not add(Better said Show) WITH the custom post in the WP-Admin.

This is the code i’ve used:

<form action="" method="post">
    <input type="submit" value="Test" id="submit" name="submit">
    <?php

    if(isset($_POST['submit'])){
    foreach ($result as $c) {
        $postargs = array(
            'post_title'   => $c->member_name,
            'post_status'  => 'draft',
            'post_type'    => 'bedrijf'
        );

        $thisid = wp_insert_post ( $postargs, true);

        if ( is_wp_error($thisid) ) {
            return get_error_codes();
        } else {  
            update_post_meta( $thisid, $meta_key, $c->memberID);
        }
      }
    }

    ?> 

</form>

A screenshot from my DB showing that it does add(Yes the meta key is correct as I only have one custom field). The meta value is also correct as I put it on LIMIT 1 in the query I have so it shows the first value of the DB only.

EDIT: To be exact it adds it in the wp_postmeta table.