I am customizing a theme that has the following code to display comments:

if ( have_comments() ) : ?>
    <h2 class="comments-title">
        <?php
            printf( // WPCS: XSS OK.
                esc_html( _nx( 'One thought on &ldquo;%2$s&rdquo;', '%1$s thoughts on &ldquo;%2$s&rdquo;', get_comments_number(), 'comments title', 'kadabra' ) ),
                number_format_i18n( get_comments_number() ),
                '<span>' . get_the_title() . '</span>'
            );
        ?>
    </h2>

however it always shows the following:

0 thoughts on “Post title”

even though I have several comments and the if ( have_comments() ) : part is passed. Any ideas?

PS: wp_debug is enabled and show no errors as well.