I think it's because you're standing in front of the garden event and the Input C from the Garden Scene when you select "No" gets carried over to Scene_Map and triggers the event. So the only thing I can think of is to reset the Input by adding an update call here in Drago's fix:
@spriteset = Nothing.new
You can even reproduce this with just Drago's script alone. Just make a map with an event that gets triggered by the action button (make it show text). Place the player's starting position directly above the event. Upon hitting "New Game" on the title screen, the event will start playing.
I will update the script on that thread. Thanks for reporting