This is likely because the shampoo is well suited for your scalp but there is an ingredient in the recipe that your strands doesn't like. The best way to customise your shampoo formula is by knowing your unique hair profile that will guide you to find the best ingredients but for now, there are already things you can test to find a better recipe! *** If you used shampoo A: The main risk is that the oil is not suited for your hair profile. We recommend reducing the amount of oil or switching it up for another oil type like jojoba, avocado oil or argan oil. *** If you used shampoo B, you may need to infuse longer your soap nuts to extract a bit more natural soap and make sure to strain the mixture really well so you don't have any powder residue in your product. There are plenty of other tweaks that can be made but these are the fist basics to cover if your hair is not clean enough with the homemade shampoo recipe!