Chunk based Voxel generation errors

I am having issues with my voxel based chunk generator
For the underground generation is simply copies the height of the first above ground chunk. How do I fix this?

these areas are completely the same just with different blocks. Ignore the gold ore in the ground it is randomized generation and will not be the same

Are you using the same seed for it? Probably add an offset onto it (offset on the seed number)

Not exactly. I solved it by adding a subtraction that took chunk offset. The underground is supposed to completely solid btw

I think you need to use 3D perlin noise

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no I said that the underground needed to be solid and not like that but the issue has been solved.

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