After updating our Zabbix server to 3.2.1 some of our agents started to report the wrong agent.hostname and agent.version: that of the zabbix server itself!

Some of the agents running 3.0.5 now claim they are running 3.2.1 and that their hostname is that of our master. However, manually retrieving the keys via zabbix_get (from the master) results in the correct data being returned.

Both items are configured are type "Zabbix agent" (which is the default of the provided template AFAIK).