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You are bulking by picture not harvest yet. Your plant is hungry for potassium and phosphorus. It is trying to put on weight. This is the plant eating itself to make up for what it is missing. Very light nitrogen. Unless these leaves are at bottom. It would be nitrogen deficiency and in that case I would not worry much. Nitrogen can hinder bud development if it is too strong in bulking.
If I correctly interpret the color of your pistils in the background, your lady is approaching harvest. It is then normal for the leaves to change colour. "Autumn" has come for the plant.