Outputing Field elements using Shortcode

Hello,

The shortcode only output the whole value of the custom field, in this case - the whole fieldset. In order to display only the values, you can create a custom shortcode to get and show the field value, like this:

add_action( 'init', function () {
  add_shortcode( 'my_meta', function ( $atts ) {
    $atts   = shortcode_atts( [
      'meta_key' => '',
      'post_id'  => get_the_ID(),
    ], $atts );
    $values = rwmb_meta( $atts['meta_key'], array(), $atts['post_id'] );
    $output = '';
    foreach ( $values as $value ) {
      $output .= $value . ', ';
    }

    return $output;
  } );
} );

You can insert that code into functions.php file of your theme or the main PHP file of your plugin. As it's your theme, it's not overwritten by WordPress.