Individual Contacts Types for Existing Users signing up for volunteer opportunity do not get changed to type VOLUNTEER

When NEW contacts sign up for a volunteer opportunity, their Individual Contact type gets assigned VOLUNTEER. This then will display custom data from VOLUNTEER INFO (custom field created by CiviVolunteer) that is used for individual contacts of type VOLUNTEER.

When EXISTING contacts sign up for a volunteer opportunity, their Individual Contact TYPE DOES NOT get assigned VOLUNTEER, so then custom data is not displayed from VOLUNTEER INFO (or any custom data) that's used for individual contacts of type VOLUNTEER.

This custom data group is useful if you want to collect additional info using the system reserved VOLUNTEER SIGN UP profile.

Currently, you will have to search for those EXISTING contacts who signed up to volunteer and manually change their individual contact type to VOLUNTEER to gain access to the VOLUNTEER INFO custom group

AND it's a best practice NOT to display the VOLUNTEER INFO custom group to ALL Individual contacts.

A scenario to consider updating Individual Contact types is if let's see you have a Media contact type who then also signs up to volunteer - you will want to preserve that they are a Media type and a Volunteer type so that custom groups that are generated for these types can be displayed.