In fact, we have 3 vCenters with VSC 4.2.1, and we never have more than 2 controllers in the provisoning & cloning TAB. It's always 2 controllers of an HA Pair. Sometimes it's 8.1.4, sometime 8.2.
I'm asking myself if Provisoning & Cloning tab doesn't take only the first registred HA pair. Does someone have more than 2 controllers in Provisioning & Cloning section ?