FF Shortcode generates Polylang warning

<?php

// Shortcode to display fastforests_status CPT
add_shortcode('fastforests_status', 'fastforests_status_listing');
function fastforests_status_listing($atts, $content, $code) {
    $ds_args = array(
      'post_type' => 'fastforests_status',
      'no_found_rows' => true,
      'post_status' => 'publish',
      'ignore_sticky_posts' => true,
      'posts_per_page' => -1,
    );


    $ds = new WP_Query( $ds_args );
    if ($ds->have_posts()) {
        $current_date = time();
        $due_date_close = 60 * 60 *24 * 40; // 40 days.
        $status_table = '<table id="fastforests_status" class="tablesorter"><thead><tr><th>Task</th><th>Owner</th><th>% complete</th><th>Due Date</th></tr></thead><tbody>';

        while ( $ds->have_posts() ) : $ds->the_post();
          $task_class = 'task_ok';
          $date_due = DateTime::createFromFormat('Ymd', get_field('date_due'));
          $percent_complete = get_field('percent_complete');

          $time_until_task_due = $date_due->getTimestamp() - $current_date;

          if ($percent_complete == 100) {
              $task_class = 'task_complete';
          } elseif ($time_until_task_due < $due_date_close) {
              $task_class = 'task_nearly_due';
              if ($time_until_task_due < 0) {
                  $task_class = 'task_overdue';
              }
          }
          $status_table .= sprintf('<tr class="%s"><td>%s</td><td>%s</td><td>%s %%</td><td>%s</td></tr>%s', $task_class, get_the_title(), get_field('who'), $percent_complete, $date_due->format('d-m-Y'), "\n");
        endwhile;


        $status_table .= '</tbody></table>';
    }

    wp_reset_postdata();
    return $status_table;
}