You forgot to set the postdata in foreach loop.
Just add this after the foreach line: setup_postdata($addon);
Here is the doc: https://developer.wordpress.org/reference/functions/setup_postdata/
That will set the $addon as the main $post for every iteration in foreach loop.
As an alternative solution, you could also add the needed post_id in ACF’s get_field method like this:
get_field(‘add_ons_suites’, $addon->ID)
That will bring the acf field data for that specific post
