Tabish,
Is it possible that under the Clients tab you see some older clients that are no longer existing? - maybe these are not reported on the "Total Endpoints" view?
here is how you can clean it up:
http://www.symantec.com/business/support/index?page=content&id=TECH175865
http://www.symantec.com/business/support/index?page=content&id=TECH168121
...after changign the settings you can rebuiild the indexs on the db and truncate the logs.