contest subscribers not on mail chimp

Hi,

I set up the contest and my contest subscribers are not transferring onto the mail chimp list despite entry of api and selection of list.
All subscribers only receive the last of the messages at the end of the double opt-in sequence, the previous one doesn’t send.

How can I resolve this please?

Competition is on gamificationnation.com

Thank you,
An

http://wordpress.org/plugins/contesthopper/