I changed one device's export address from one remote collector to a "local" collector, which is in same LAN as Central Server. Due to poor link between remote collector and Central Server, there was no details in traffic inspection, there is only one chunk - unaccounted. 

By exporting flows to the "local" collector i have all the data i need, it's just that now i want to delete the "old" device from the remote device group, and add the "new" device to it, even though it's the same device, it just stopped exporting to remote collector. 

But no matter how many times i tried to add the new device to the device group it belonged, it does not work; i even tried to delete the whole device group, restart service, restart server, nothing works. I can add the device to the device group, but it does not get displayed there. What am i doing wrong? 

thanks!