Device Sync group automatically created

Hi Everyone,

Recently I came across a situation when I installed the TMOS 11.6.0 to the LTM units and created the Device group after that when I click to sync the configuration I found that there is another group existing named as Device_Sync which is a sync only group and the sync is set to automatically sync but when I check in the Device group I didn't find this group. Is it a bug or what? is it a known problem and how to remove it.

Regards,