I think there is something strange about the chart. If you look at it closely it has "healthy weight" and then "moderately overweight" in the same gray area. But if you look closely at it, there is a heavier dark line that ends within the moderately overweight area. I think if you trace an imaginary line from the top of the chart where that heavier line ends to the lower end of the heavier line at the bottom part, you find your "moderately overweight" area doesn't cover your goal weight. It looks to me like it is saying that anything from 130 to 160 would be healthy weight for someone 5'9".
It is like you need to divide that light gray area in half. The white area is for underweight. So I agree that you aren't reading the chart correctly.
However, that having been said, I think that the chart would be more accurate if it took into consideration your age, your gender, and your frame size. It is rather generic and with that grey area not divided so that you can actually understand that is what they mean, it looks even more inaccurate.
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