Discovery of the Problem of Android Builds

So I tried to find out what's been causing the android build to be seen as a new program by the system.
I tried redoing what I always do before I build .apk files for the update:
Altering config.version
Changing the apk file's name
Changing the whole game in a new folder
Changing the configuration
But none of it made the problem reappear.

But it wasn't all for nothing.
During my attempt to put the whole game in a new folder and build an .apk file, I got an error report in the Ren'Py SDK for undetected keystore files, which shouldn't happen, because the keystore file was right there.
So, I think the problem was on the keystore file.
I regenerated a new set of keystore file, I do think it will fix the problem but it requires observation.
And it also means that the game will be seen as a new program and be installed as a double  and cause complete progress loss again in the next update. (if you have the last build installed)
It's a sore progress we have to go through to fix this issue, Sorry if it brings you inconvenience.