Following CRM Online 2015 to 2016 Upgrade - All Duplicate Detection Rules were enabled.

Recently a customer of ours upgrade from CRM Online 2015 to CRM Online 2016.  Following the upgrade we realized that all of the duplicate detection rules were activated.  Previous to the upgrade this was not the case.  Has anyone else seen this?  I have not seen this happen in some of my other CRM Online customers.

Thanks,

John.