Sometimes Monument's facial recognition will not be able to automatically add new photos to the correct person and will create a new group for that person instead. When this happens, you can manually merge the suggested person to the existing person.
- Select the "Browse" tab and click on "People"
- Click "Add New Person"
- Click on person and enter the same name as the person you'd like to merge with
- Click 'Merge' or 'Cancel'