The forms are most likely being referenced from old "Main Site". The data can be accessed by updating the "Forms created on" search option of the forms section.
  1. Go to Site Explorer > Forms
  2. Select the Data tab
  3. Click the binoculars in the space labeled: "Forms Created on:"
  4. Choose the old site.
  5. For "Form" select the name of the form you wish to pull the data for.
  6. Click Search
  7. You should now see the new submissions for the form on the data tab and the form name should display on the Forms tab

*NOTE: Click the "Date Changed" column header to sort the record in ascending order then go to the last page to see the most recent submissions.