Glad you find the game interesting. :)
I think I know what's the problem: When you left for the waterfall screen, did you exit from the left or right tile, instead of the central one? I think I forgot to update all the exits. This didn't come up before because the central tile is usually the one used (since it's where you appear when you enter the room from the waterfall, and it's in line with the temple's door).
Anyway, this will be fixed in version 0.992, thanks for the report!