I realized that the Litwick torch/soul torch spawning buff was always active, regardless of whether torches were nearby.

After studying its spawning code, I recalled that Composite Conditions do not work in rarity multipliers. Instead, I've created a duplicate spawning entry that uses the composite condition outside of the rarity multipliers, and adds the amount I wanted the rarity multiplier to add.

Lampent and Chandelure were free of similar problems because they never spawn unless composite conditions are met, and thus their composite conditions are written correctly from the beginning (and not incorrectly as part of a rarity multiplier)