Thakns Jon, I will organise. I am not confident that it will replicate on the call as I am not sure how immediate it is between creating an account on the website to an accoutn being created in CRM to it duplicating. But I can try.
i will schedule a call, I may ask our IT support to join me too.
I have replicated the issue by signing in with my personal email and that did create the contact, without an email, and create duplicates. Our IT support wondered whether the duplicates are being created because the email address is not being transferred from MailChimp to CRM so it just keeps trying. I can confirm that the acount I created for myself is working from a mailchimp perspective as I am receiving the emails that I have signed up to.
The version, I think, is Version 7.7.5 nSugar Version 6.5.24 (Build 509) - that is what it says in the about page
Do you have any workflows or customizations in SugarCRM that are running on Contact creation? - I dont believe so.