why there is another branch of kafir leaves with spikes, different leaves and fruits, could it be parasites, should i cut and kill

Question

please see photo…many fruits..but fruits are hard different from usual.
within the same branch below is the original, which i often take its leaves for cooking

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Answer 1

No, this happens when a segment below the graft point (which is a completely different citrus) is allowed to grow and overtake top graft branch. Those should be kept cut off to avoid taking nutrients and outcompeting the original grafted branch. Ultimately this can result in the death of the Kaffir top, leaving only the grafted root portion to continue growing.

This article will explain this process common to all citrus that are grafted: https://www.gardeningknowhow.com/edible/fruits/lemons/suckers-on-lemon-trees.htm