Calling it too late could also be a problem. Try calling in on init
add_action('init', 'setup_acf_form');
function setup_acf_form() {
acf_form_head();
}
The scripts that should be loading are acf-field.min.js and acf-field-group.min.js (or the same without .min depending) and these should be visible in the source of the page.