Splunk for Asset Discovery: Receiving out of date data

Hello, I have installed Splunk discovery app and set the nmap command as C:\Program Files\Splunk\etc\apps\asset_discovery\bin\nmap.cmd -A -O -t 172.17.0.0/16 10.2.237.0/24 I am getting data for 2017, not current data 29-09-2019. Please do needful Thanks Lalit