We can do snmp walk from AMPCLI>Advanced>Enter Commands and check if client count details coming from switch or not.
wlsxSwitchTotalNumStationsAssociated OBJECT-TYPE
SYNTAX Unsigned32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"
Total Number of Stations Associated to this switch.
Example, use syntax which ever protocol you are using to monitor devices.
$sw2 <ap_id> wlsxSwitchTotalNumStationsAssociated
$sw3 <ap_id> wlsxSwitchTotalNumStationsAssociated
replace ap_id with device id which we get from Devices>monitor page URL of switch in Airwave.