Hello xxli.
I think you understood the riddle and the order of the colors (White - Green - Orange - Blue). Did you click on the central button (the one with the key) at the end?
I don't understand. In nearly a year and a half out of nearly 100,000 players, never once has anyone come to tell me about such a bug. Sorry for not being able to help you more. I would almost need a video of your part to be able to understand. I can't guarantee you anything but you should try to play on another browser (if you haven't already).