Pagination Broken on Loop using ACF

Your query displays the first 9 posts regardless of page because you don’t set the page number in your query arguments.

$paged = ( get_query_var('paged') ) ? get_query_var('paged') : 1;
$args = array(
    'post_type' => 'issues',
    'posts_per_page' => '9',
    'order' => 'ASC',
    'paged' => $paged
);