Hey there. Unfortunately the comments section is not working. Everything is set correctly wordpresswise. Pls help! I think the comments php is somehow broken. I setup a child theme. Maybe I missed something? 

Here is the comments.php. Maybe you find something incorrect. I have not changed a thing here.

<div id="comments" class="comments-area">

    <?php if ( comments_open() ) :

        echo '<h4 class="section-title underline">';

        comments_number(__( 'No Comments', 'wundermag' ), esc_html__( '1 Comment', 'wundermag' ), '% ' . esc_html__( 'Comments', 'wundermag' ) );

        echo '</h4>';

    endif; ?>

    <?php if ( have_comments() ) : ?>

        <ol class="comment-list">

            <?php

                wp_list_comments( array(

                    'style' => 'ol',

                    'short_ping' => true,

                    'avatar_size' => 60,

                    'max_depth' => 5,

                    'callback' => 'wundermag_post_comments',

                    'type' => 'all'

                ) );

            ?>

        </ol><!-- .comment-list -->

        <div class='comments_pagination'>

            <?php paginate_comments_links(array('prev_text' => '&laquo;', 'next_text' => '&raquo;')); ?>

        </div>

    <?php endif; ?>

    <?php

        $commenter = wp_get_current_commenter();

        $req = get_option( 'require_name_email' );

        $aria_req = ( $req ? " aria-required='true'" : '' );

        $wundermag_fields = array(

          'author' => '<p class="comment-form-author"><input id="author" name="author" type="text" placeholder="' . esc_html__( 'Your Name', 'wundermag' ) . ( $req ? '*' : '' ) . '" value="' . esc_attr( $commenter['comment_author'] ) . '" size="30"' . $aria_req . ' /></p>',

          'email' => '<p class="comment-form-email"><input id="email" name="email" type="text" placeholder="' . esc_html__( 'Your Email', 'wundermag' ) . ( $req ? '*' : '' ) . '" value="' . esc_attr( $commenter['comment_author_email'] ) . '" size="30"' . $aria_req . ' /></p>',

          'url' => '<p class="comment-form-url"><input id="url" name="url" type="text" placeholder="' . esc_html__( 'Your Website', 'wundermag' ) . '" value="' . esc_attr( $commenter['comment_author_url'] ) . '" size="30" /></p>',

        );

        comment_form(array(

            'title_reply' => esc_html__('Leave a Comment', 'wundermag'),

            'title_reply_before' => '<h4 id="reply-title" class="comment-reply-title section-title underline">',

            'title_reply_after' => '</h4>',

            'logged_in_as' => '',

            'comment_notes_after' => '',

            'comment_notes_before' => '',

            'comment_field' => '<p class="comment-form-comment"><textarea id="comment" name="comment" cols="40" rows="8" aria-required="true" placeholder="' . esc_html__( 'Your Comment', 'wundermag' ) . ( $req ? '*' : '' ) . '"></textarea></p>',

            'cancel_reply_link' => '<i class="ion-android-close"></i>',

            'label_submit' => esc_html__('Post Comment', 'wundermag'),

            'class_submit' => 'btn',

            'fields' => apply_filters( 'comment_form_default_fields', $wundermag_fields ),

        ));

    ?>

</div><!-- #comments -->