Pagination problems with multiple custom post type archive pages

Your problem comes from a fundamental misunderstanding of how WordPress loads the main loop.

Here you have a main query that goes and grabs the posts to display in your post type archive. It then decides to load archive-recept.php based on that query.

The call to paginate_links then provides the pagination for that main query. However, the main query isn’t being used.

Instead what you’re doing is ignoring the main query, calling your own query ( doubling the DB work involved ), then expecting the pagination links to give you pagination for your get_posts query, rather than the main query.

This is functionally equivalent to calling query_posts, which as we know is bad practice.

Instead, use the pre_get_posts filter to modify the main query before it happens, e.g. something similar to:

function wpse182971( $query ) {
    if ( $query-> is_post_type_archive && $query->is_main_query() ) {
        $query->set( 'posts_per_page', '8' );
    }
}
add_action( 'pre_get_posts', 'wpse182971' );