Articles duplicade

Hi i have problems with my site due to duplicate posts.

I know that the following code compensates for the number of articles shown in highlights to avoid duplication.

add_filter( 'pre_get_posts', function( $query ) {
    if ( $query->is_home() && $query->is_main_query() ) {
        $offset = 4;
        $ppp = get_option('posts_per_page');

        if ( $query->is_paged ) {
            $page_offset = $offset + ( ($query->query_vars['paged']-1) * $ppp );
            $query->set('offset', $page_offset );
        } else {
            $query->set('offset',$offset);
        }
    } else {
        return $query;
    }
} );

The problem is that this does not help me because in the WP Show Post grid I am only showing articles from 2 specific categories. So the above code removes the articles that you shouldn’t delete because they were never in the WP Show Post grid. I have tried to adapt the filter above so that it only removes 4 items from the list that always belong to the category I have in the WP Show Post grid, but I can’t get it to work, my knowledge of PHP is very basic.

My site web is: https://cutt.ly/EniZHH0 In the Home you can see the duplicate articles.

Is there a solution to this? Thanks a lot!