JUNGLE and FOREST tags are not meant to be used together and all the rainforest variants suffer from this.

BiomeDictionary.addTypes(RAINFOREST.getKey(), Type.JUNGLE, Type.FOREST, Type.OVERWORLD);

What this causes is that rainforests will spawn in temperate areas amongst standard vanilla forests and birch forests for example.

The solution is pretty simple, remove FOREST from all the rainforest type biomes.

BiomeDictionary.addTypes(RAINFOREST.getKey(), Type.JUNGLE, Type.OVERWORLD);