You can fix this by forcing a re-sync of the master to the slave. However, doing so will zero out all devices on the slave. Any poller data in HUM for those devices will be lost. To do a resync, set the Master DCR server to standalone and do the same for the slave server. Then set the master server back to master and the slave server back to slave. It may take a few minutes to sync all the devices, but you should eventually see the slave device count equal that of the master (confirm this on the slave's Common Services > Home page).
