Unity Analytics: Is "New Users" count wrong? Or do I missing something?

Hello All.

We just started Alpha tests recently. But when I take a look at Unity Analytics Data Explorer, I saw much more "New Users" count than I expected. Our Internal QA Team consists of 9 people. And only they have access to the game at the moment. So I expect to see "9 new users" at Analytics. But I see 40 new users (18 for the first test day and 22 for the second day). What is Going on here, Can someone explain it to me?

here some screenshots:

from Unity Analytics

from Google Play Store