Protein question

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I am down to losing the last 15 pounds before I hit my target weight. I still need to get rid of the belly fat so I was looking at the percentage of protein that I was in taking. I set my goal to 20% of my daily intake being protein which would be the correct amount of protein which is 83 g. However the nutrition details when I look on what I've eaten for the day says my goal is 78. Why is there a discrepancy between the goal andThe goal number in the nutrient?