So, I had this same problem, and then realised it was because my play store was automatically updating apps. As soon as I stopped that, the game stopped updating the demo, and the problem didn't come back. So go to your play store settings and stop it from automatically applying updates. It's a bummer, but right now what's happening is that the demo is overriding your full version every time it updates through the play store.
Hope this helps :)
Lafaeyette
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A member registered Nov 25, 2020