We have an app for both Android and iOS that are tracked with Firebase Analytics. For both of these we get a higher active monthly users from Firebase Analytics compared to number of downloads of the app from Google Play developer console and iTunes Connect. This post describes how reinstalls can skew the monthly active users count but I don't think that it explains the downloads/active users for a released app.
How can this be? There must be something with how downloads and active users are counted that make phenomenon. Can it have something to do with multiple devices for one Google or Apple ID account?