Either you corrupted something, or more likely you modified the Jyotyu palette somehow.
Did you import the Jyotyu tileset from, say, NewerDS? It uses a different palette than the original game does.

Whatever the case, you will most likely have to modify the bitmap of the minigame question blocks to make it correspond to the new palette.

Try to find the bitmap in the OBJ folder, open it alongside any of the Jyotyu palettes, export the bitmap to an image, fix the blocks in that image, and import the image back into the editor specifically using 'import with existing palettes' (otherwise your Jyotyu tileset will now look weird).