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Randomly generated worlds almost always have instability.
Much instability is caused by conflicting symbols. A prominent example of this is selecting the Single Biome symbol and adding multiple biomes. Remember, there is no erase function, so once a symbol is written into the descriptive book it is there forever. Note that multiple skies can be mixed to create different colors, and won't effect the stability of the world. Although symbols cannot be changed some properties can, see this page for details.
A dense ore world will always be unstable. This can be partially counteracted by adding symbols like Charged, Meteors, and Spontaneous Explosions.