repeating posts on 2nd page to posts

Use this in your child themes functions.php file

add_action( 'pre_get_posts', 'exclude_category_posts' );

function exclude_category_posts( $query ) {

if( $query->is_main_query() && $query->is_home() ) {

$query->set( 'cat', '-27,-30' );
    }
}

Add a comma separated list of category i.d’s to the set.

Never Use Query Posts

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