Hi,
If you are doing a secondary on a page, you’d need to pass the pagination argument into your WP_Query.
https://codex.wordpress.org/Class_Reference/WP_Query#Pagination_Parameters
$paged = ( get_query_var('paged') ) ? get_query_var('paged') : 1;
$query = new WP_Query( array( 'paged' => $paged ) );
Cheers.