Fortimanager Devices-VDOMs Count doesn't change after device deleted

Hi,

In FMG v5.6.7, we are using ADOMs in Advanced ADOM Mode.  We have configured three separate ADOMs, each of which have several Fortigate devices added.  In one of the ADOMs, I deleted a couple of Fortigate devices and then checked the Devices-VDOMs count under the FMG System Settings - Dashboard.  The count did not go down by two, as I would have thought.  It stayed at the previous count.

Has anyone encountered this before?  If so, how do I get FMG to accurately reflect the correct count?

Thank you for your time.

LarW63