Hi there,
GP doesn’t have anything to do with the post ordering, we leave the Main Query as WordPress sets it, which is to list Posts in reverse chronological order based on the published date.
If that is not the case then there is a custom function or plugin that is changing the main query.
If you want the posts listed in some other order, eg. by orderby modified date, then you can do that using a PHP snippet:
function orderby_modified_posts( $query ) {
if($query->is_main_query()) {
$query->set( 'orderby', 'modified' );
}
}
add_action( 'pre_get_posts', 'orderby_modified_posts' );