Number of contacts and domains that were selected and approved. A contact is selected for verification if a new registration for that contact is suspicious. The registration is then also automatically selected for verification. If that contact is used for multiple new registrations, multiple domains are selected for verification. This can explain the difference in selected contacts versus selected domains in a month.
When the identity for a contact is verified, the contact and all its linked new registrations are approved. It is possible that a contact is verified in another month than the month it was selected for verification. This can result in situations with more approvals than selections in a month.