AJAX WP_Query’s order and order by parameters not working

If you are using AJAX to retrieve results from a WP_Query object and the order and orderby parameters are not working as expected, there are a few things you can try:

1. Check that the values of order and orderby are being passed correctly to the WP_Query object. You can do this by adding var_dump() statements to your code to inspect the values of these parameters.
2. Make sure that you are using the correct values for order and orderby. The orderby parameter should be set to the name of the field you want to order by, such as date, title, or meta_value. The order parameter should be set to either ASC or DESC.
3. Check that the field you are trying to order by is actually sortable. For example, you cannot order by a custom field that does not have a value for all posts.
4. Try adding the ignore_sticky_posts parameter to your WP_Query object, like so:

$args = array(
    'post_type' => 'post',
    'orderby' => 'title',
    'order' => 'ASC',
    'ignore_sticky_posts' => true,
    'posts_per_page' => 10
);

$query = new WP_Query( $args );

This will ignore any sticky posts that may be affecting the order of your results.

5. Finally, if none of the above solutions work, you can try using the pre_get_posts action hook to modify the query before it is executed. For example:

add_action( 'pre_get_posts', 'my_custom_query' );

function my_custom_query( $query ) {
    if ( is_admin() || ! $query->is_main_query() ) {
        return;
    }

    if ( $query->query_vars['post_type'] == 'post' ) {
        $query->set( 'orderby', 'title' );
        $query->set( 'order', 'ASC' );
    }
}

This will modify the query before it is executed, ensuring that the orderby and order parameters are set correctly.