Android : I am tracking my Android app on Google Analytics. Why do I appear to have Macintosh users?

The facts:

1. My company has developed an Android app.


2. My company has NOT developed an iOS version to this app in anyway.


3. I have created a Google Analytics account, opened a mobile app tracking ID, and connected it to my Android app using the SDK (this was not done by me, but by our developer).


4. Our app launched and has some users according to both our Google Analytic's account and the Google Play Developer Console account.

In the Google Analytics if I examine the operating systems of my users my operaiting split is: Android - 91.69% Macintosh - 8.05% (all Macintosh 10.10) iOS - 0.26% (all iOS 8.1.2) How is this possible? We haven't developed for iOS.