You wouldn't perchance have an Android emulator, something like BlueStacks, installed on a PC and configured to download apps from Google Play, would you? What you describe is exactly my situation and it turned out to be caused by BlueStacks installed on my PC. Evidently the emulator is coded to look like a Samsung phone when logged in to Google.
That's it, thanks! It was around that time that I tried an Android emulator on my PC.