Which Contacts comes in the list of "Track Contacts" under Sponsor Tracking

HI Team,

Which Contacts under an Account comes for “Track Contacts” table under Sponsor Tracking.

I am using Sponsor Tracking in one R360 (Relationship Level) and when clicking on +Sponsor then only 7 out of 29 contacts (under the Parent Account) comes in the “Track Contacts” table. Wanted to know how Gainsight filters to show limited number of contacts under the parent Accounts.

Thanks!