Hi Raji,
Good Day. It may be possible that there is duplicate entry of the server which might have not associated with iLO.
In SIM search box, search with server serial number, FQDN and IP, if more that one entry for the server are found, those might cause issue.
Delete all the entries including iLO for these devices and rediscover. If issue persists post this then would request you to log a support ticket with us.
Regards,
Bunsol.