This is clear but the numbers are very strange to me!
I’m sure that the API calls, since 1 february, have been made only from two different users because is a test app.
In another app, that it is in production, I have some numbers (active users) that are strange too. Obviously in that app it’s more difficult to check how many users have made at least 1 API call.
Starting from the numbers of the production app, I checked the active users of the test app (used only from my collaborator with one account, not from me) and I saw that there were 7 active users. Then, I made some try with my account and the active users became 8 and in this count all is ok.