Mismatch between Power BI and Google Analytics

My data in Power BI is not matching with Google analytics

What I am trying to do is to recreate the Segment called: Organic traffic from Google Analytics in Power BI.

So I first tried to connect to Power BI, chose the Event Action, Event Category, Event label from the "Event tracking folder"

and Date from the "Time" folder. With these selections, I have a total event: 18056. (which mitches the result in Google Analytics)

But once I added the "Medium" From a folder called "Traffic", the result changed.

Can someone please tell me what causes this and how can I fix it. Thank you