When reviewing a cluster from the "Storage overview" section in vCenter the cluster does not have a consistent device or drive count.
VMware ESXi (All Versions)
The ESXi hosts do not have the same devices presented to them such as USB devices, local disks or other storage.
In the example below the hosts have the same FC devices presented to them but host 11 also has a local USB device presented causing the Device count to be 30/30 vs 29/29
Review the host configuration and determine which device/adapter is causing the discrepancy, if that device/adapter is needed then open a case with Broadcom Support for further assistance. Otherwise this can be safely ignored as it's not an issue.