Update: I saw your post in the comment section of the Spanish translation! In internal discussions the translators said that they don't even offer an Android version, which very much begs the question how you even got here.
Are you using an emulator to play the game on Android? Joiplay maybe? If yes, maybe Joiplay has a setting for activating self-voicing. Or Joiplay can emulate a PC keyboard and you accidentally brought it up and pressed V on it. Those are my theories so far.