TOPIC: CB Plugin - Mapped fields not sent to MailChimp

We have the CMC component installed as well as the CB plugin enabled and configured. We have several field mappings configured in the CB plugin. See attachment.

The only field being sent to MailChimp, or appearing with the user in the CMC component, is the email address. What are we missing? At one point the email address, first name, and last name were sending but after we added the additional merge tags we also lost first name and last name.