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Note that the double opt-in setting in your Mailchimp account is ignored, for our forms that setting is in your WordPress admin under MC4WP > Form > Settings. It it turned off there?
When the log shows success, we got confirmation from Mailchimp that the subscriber is received, from there it is out of our hands.
I did notice that sometimes Mailchimp is slow to update totals, so it might be that the subscriber is there and visible in the audience, but the total still shows 0?
Hope that helps. If you have any questions, please let me know!