Multiple API calls going to the Service

Hello,

I have Power BI Query which has M Code to make a single API call. But when the query is monitored in Fiddler I see there are 2 API calls made.

I saw a similar thing in Power Query and Power Pivot too. Is it done once for ETL and once for loading into the data model? How can I limit it to make only one call as the API to which the call is made not only gets but posts data on the server.

Any pointers appreciated.

Thank You,

Harisha