losing content when choosing Package on add listing page

I made a test at this address for you to troubleshoot:
http://dev.intouch.green/ajouter-entreprise/?listing_type=gd_place

Works fine until we select a package – then the page reloads, with &package_id=3 in url.
The reloaded version misses some content im injecting through a custom function:

function huge_addlistingpage_test(){
    $buffer = "";

    //empreintes
    $id = 890;
    $post1 = get_post($id);
    $content1 = apply_filters('the_content', $post1->post_content);
    // $content1 = "test";

    $buffer .= '<div class="addlisting_test">';
    $buffer .= $content1;
    $buffer .= '</div>';

    wp_reset_postdata();

    echo $buffer;
}

add_action('geodir_add_listing_test', 'huge_addlistingpage_test');

Please advise me how to properly inject my custom content into that page. Ive already copied the “geodir_action_add_listing_form_custom” from the plugin and replaced the calls in the add-listing.php template.

To avoid “hardcoding” any content in there, ive put the needed content in wordpress pages and im pulling it from there with a similar function than the one mentioned above. It works fine until we add the &package_id=3 parameter to the url.

So ive added lorem ipsum inside a blank page and turned my builder off on that page to make sur it doesnt interfere. It still cuts the lorem ipsum content.

I don’t know where to go from here, please advise how I can make it work, thanks.