Lansweeper scans event log entries according to your setup under Configuration\Server options, section Eventlog scanning. If you enabled scanning of Warning events, Lansweeper scans all Warning events. The same applies for Information events. Under Configuration\Custom scanning, section Eventlog ignore, you can define which event ID's should not be scanned by Lansweeper.
We recommend that you verify if the event you are scanning is a Warning or an Information event.