This can happen if you are not displaying the Applicant address fields on the Inquiry Form. These would need to be showing on your form in order for an address to be added to a Candidate. 

To check this: 
  1. Navigate to Enrollment Management, select Admissions, then Admissions Setup 
  2. Select the Inquiry Forms Tab
  3. Click edit next to the Inquiry Form
  4. Select the Tab in which the Applicant block is located and make sure the address fields on the Applicant block are set to Show.
If the field is locked down, it will be best to create a new inquiry form activate it, then inactive the old form. Moving forward, the Candidate Address will populate on the contact card after processing.