Hey Tanya
If a conditoner or a treatment is deep conditioning then it’s usually very moisturising so I would think that the problem may lie in one of your other products. Are you using any heat protecting products when you’re styling your hair or are you using a shampoo that may be high in sulfar and sodium that could be weakening the strength of your conditioner? Either way try using a different shampoo first then try changing your range. Either of the two should show better results.