this
add_action( 'admin_menu', 'sitepoint_settings_page' );
should be
add_action( 'acf/init', 'sitepoint_settings_page' );
and since you are calling acf_form_head(), this should not be necessary
do_action('acf/input/admin_head'); // Add ACF admin head hooks
do_action('acf/input/admin_enqueue_scripts'); // Add ACF scripts
