Hi! Thanks for bringing it to my attention ^^
It's due to me forgetting to put an action to the "No" button. For a quick fix, just search for
screen confirmbutton():
in the screens.rpy. You'll find a textbutton with "No" in it and "action Null" after. Simply just change it to action Hide("confirmbutton")
I'll add it to the original file as soon as I can.