Two style.css file versions

Please show the child’s functions.php where it enqueues it’s own CSS and the parent and provide a link to the actual site.

Please share the code for the functions.php file in order to see the problem.

Thanks for the answers. Here you go:

add_action( 'wp_enqueue_scripts', 'my_theme_enqueue_styles' );
function my_theme_enqueue_styles() {
    $parent_style = 'parent-style'; 
    wp_enqueue_style( $parent_style, get_template_directory_uri() . '/style.css' );
    wp_enqueue_style( 'child-style',
        get_stylesheet_directory_uri() . '/style.css',
        array( $parent_style ),
        wp_get_theme()->get('Version')
    );
}

You really don’t need to enqueue the child theme’s CSS as that happens automatically.