Weird automatic subscriptions

First, good work for this plug-in. It is one of the easiest post notification plugins for WordPress.

I have only a weird problem. When a use makes an account, it is automatically added to the Public group. I have double opt-in enabled, but even that is skipped. Maybe is there a setting I missed, but I think is a bug. I have a subscription form which read the user email and name, so the user only have to press the button.

  <div>
      <form class="es_shortcode_form" data-es_form_id="es_shortcode_form">
        <div class="es_lablebox"><label class="es_shortcode_form_name">Naam</label></div>
        <div class="es_textbox"><input name="es_txt_name_pg" class="es_textbox_class" id="es_txt_name_pg" type="text" maxlength="225" value="<?php
          global $curren_tuser;
          get_currentuserinfo();
          echo $current_user->display_name;
          ?>"></div>
        <div class="es_textbox"><input name="es_txt_email_pg" class="es_textbox_class" id="es_txt_email_pg" style="" type="hidden" maxlength="225" value="<?php
          global $curren_tuser;
          get_currentuserinfo();
          echo $current_user->user_email;
          ?>"></div>
        <div class="es_button"><input name="es_txt_button_pg" class="es_textbox_button es_submit_button" id="es_txt_button_pg" onclick="return es_submit_pages(event, 'https://thomasatsea.nl/blog')" type="button" value="Abonneren"></div>
        <div class="es_msg" id="es_shortcode_msg"><span id="es_msg_pg"></span></div>
        <input name="es_txt_group_pg" id="es_txt_group_pg" type="hidden" value="Nieuw bericht">
      </form>
    </div>

It works correct and add the user to the list ‘Nieuw bericht’. That is not the problem, I think.

Beside this function I have another feature request. Make it possible to send one time a week an blog post notification with in the mail all post’s since the previous mail.

The page I need help with: [log in to see the link]