Ascending order has strange effects on wordpress loop

Question

I have a custom loop:

$args = array(
    'post_type' => 'symposia_program',
    'taxonomy' => 'days', 
    'term' => 'day-1',
    'order' => 'ASC'
);

$query = new WP_Query($args);
if ( $query->have_posts() ) :
    while ( $query->have_posts() ) :
        $query->the_post();
        .....(code)....
    endwhile; 
endif;
wp_reset_query();

For some reason, the 'order' => 'ASC' parameter has strange effects on the output of the loop. Basically it doesn't render some of the posts, namely some recent ones. If I switch back to DESC, all the posts show up. Please help!

Answer 1

It seems the problem is solved by adding 'posts_per_page' => -1 which forces WordPress to show all posts matching the parameters. Here's my final code:

array ( 
    'post_type'      => 'symposia_program', 
    'days'           => $progDay, 
    'meta_key'       => 'class_number', 
    'orderby'        => 'meta_value_num', 
    'order'          => 'ASC', 
    'posts_per_page' => -1 
);