SM64: Curse of Level Corruption

SM64: Curse of Level Corruption
this is my first rom hack so please dont roast me thinking this is my 10,000,000th rom hack

Everything starts off normal. You walk into the castle and go to Bob-Omb Battlefield. Hold up, that's not quite right...
You get the first star, come back for the second, and see that now there's a green pipe. You enter the pipe, and you get teleported back to the exact same level.
But something changed. Why is everything so dark now? Where's the music? You continue playing, and the green pipe haunts you for the rest of the gameplay...