Hi, Yanonako! Honestly, when I updated the Ren'Py, several bugs popped out :')
Like, the timer bar for the timed choices is no longer sliding, but more like 'ticking', the mouse doesn't hightlight choices well, and... then this one. And you know what? I've just discovered the cause of the problem... :'D
So I usually put a pause on the screen, the one I used was:
$ renpy.pause (1, hard=True)
Turns out the correct code is:
$ renpy.pause (hard=True)
That frickin' 1 is the thing causing problem! I will update the game ASAP!