Ideally, devices discovered in Operator Console should automatically reflect in the Admin Console but discovery / syncing is not happening for one of the hubs.
The snmpcollector probe uses ONLY SNMP, whereas the Operator Console (OC) uses several methods such as SNMP, SSH/Telnet, and WMI to discover devices. Also with SNMP, the device must be reachable over the network, you must have the correct credentials, and SNMP agent must be enabled, and no blocking/interference/filtering, e.g., IDS.