Data Card mapping to Contact information

I have a current implementation for Eloqua set up to when a new customer registers on my ecommerce platform, a new data card and contact are created (and I assume mapped).  An email is then kicked off for the new registrant to confirm registration.  Once that new use clicks to "verify their registration", another data card is created for that contact with two more fields populated.  I would like to have those two CDO fields mapped to corresponding fields in that person's Contact record.  I have them mapped, but the contact record fields aren't being updated with the data from