Contact created, not subscribed

Hi there –

I have an issue where, customers that check the box during checkout are getting created as contacts in Constant Contact, but they’re not added to any lists at all.

They do not show up in the WooCommerce All Customers list (or any others). The only place I can see them is the full list of contacts at https://app.constantcontact.com/contacts, listed source is WooCommerce.

Screenshot of contacts created but not added to any list: https://www.awesomescreenshot.com/image/63041632?key=70f4e98a0bad024651432ed759350279

Any ideas here?
Thanks for your help.