code from your original question. Is this exactly the code in your template?
acf_form_head();
$options = array(
'post_id' => 'user_'.get_current_user_ID(), // $user_profile,
'field_groups' => array(115),
'submit_value' => 'Enregistrer',
'updated_message' => __("Profil mis à jour", 'acf'),
);
acf_form( $options );