Problems with Post Thumbnail Link and Comment Function

Hello,

I ran into 2 strange problems while using Enfold:

1) On the single posting view, the thumbnail image (featured image) links to a completely different image (from another posting), which then gets opened in a lightbox. How can I change this?

2) When I post a comment on the single view of a normal blog posting, I then get redirected to the single view of a portfolio item (sending you example links in the private content area), with #comment-NUMBER added to the URL of that page.

I have changed the name of the portfolio items with a function I’ve found in this forum, here is the code from my child themes functions.php:

/** Change name of "Portfolio Items" to "Museen"
/* Code from: https://kriesi.at/support/topic/renaming-the-portfolio-custom-post-type-child-theme-issues/#post-564363
*/

function unregister_taxonomy(){
	global $wp_taxonomies;
	$taxonomy = 'portfolio_entries';
	if ( taxonomy_exists( $taxonomy))
		unset( $wp_taxonomies[$taxonomy]);
}
add_action( 'init', 'unregister_taxonomy', 30);

// portfolio args
add_action( 'init', 'init_reg_portfolio', 50 );
function init_reg_portfolio() {
	add_filter('avf_portfolio_cpt_args', 'avf_portfolio_cpt_args_mod', 50, 1);

	$tax_args = array(
		"hierarchical" => true,
		"label" => "Museen Kategorien",
		"singular_label" => "Museen Kategorie",
		"rewrite" => array('slug'=>_x($permalinks['portfolio_entries_taxonomy_base'],'URL slug','avia_framework'), 'with_front'=>true),
		"query_var" => true
	);

	$avia_config['custom_taxonomy']['portfolio']['portfolio_entries']['args'] = $tax_args;

	register_taxonomy("portfolio_entries", array("portfolio"), $tax_args);
}

add_action( 'after_setup_theme', 'init_reg_portfolio' );

function avf_portfolio_cpt_args_mod($args) {
	$labels = array(
		'name' => _x('Museen', 'post type general name','avia_framework'),
		'singular_name' => _x('Museum', 'post type singular name','avia_framework'),
		'add_new' => _x('Hinzufügen', 'portfolio','avia_framework'),
		'add_new_item' => __('Museum hinzufügen','avia_framework'),
		'edit_item' => __('Museum bearbeiten','avia_framework'),
		'new_item' => __('Museum hinzufügen','avia_framework'),
		'view_item' => __('Museum ansehen','avia_framework'),
		'search_items' => __('Museen durchsuchen','avia_framework'),
		'not_found' =>  __('Kein Museum gefunden','avia_framework'),
		'not_found_in_trash' => __('Kein Museum im Papierkorb gefunden','avia_framework'),
		'parent_item_colon' => ''
	);

	$args['labels'] = $labels;
	return $args;
}

I have neither altered the comments template, nor the includes/loop-index.php!
Any help would be appreciated!

Thanks in advance,
Stephanie Jagl-Posch