My integration with MailChimp functions, but I am losing email addresses.
Current # of users in Thinkific is 9
Current # of users in Mailchimp list is 6
How can I fix this?
If you're noticing that the number of students signing up to your course site and the number of students exported to your MailChimp mailing list isn't lining up, this is probably because they are either duplicate sign ups or these students signed up for your course site after you integrated with MailChimp.
You can always update your MailChimp list with an export of your students via the Users report. Here's how to do that: http://help.thinkific.com/support/solutions/articles/221780-mailchimp-how-to-import-existing-users-into-a-subscriber-list
oh okay...so there isn't a one way sync form Thinkific -> Mailchimp ?
Yes, there is. If you integrate with Mailchimp, all of your students signing up for a course after you integrate will be imported into your Mailchimp list.
Does that answer your question?
Let me know if you'd like some more information about this.