I've played other games made in Ren'Py and doesn't encounter same problem.
As for the anti virus, Im not sure but I think I doesn't get a notice for unknown sources in files. I tried to re download it again and there doesn't seems to be something that was deleted.
As for the problem, it is also happening in the ingame texts and narrative, every single words that is possible in the game.
That is the only problem that I've encountered so far