You’re looking at two different composition analyses and trying to equate them. For the body fat percentage, that comes from an analysis of the percentage of weight made up from fat, muscle, and “other” (Bones, organs, skin, etc) So your percentages there need to add up to 100%.
For the water percentage, that comes from a molecular breakdown of the body. If you separated a person into their individual molecules, 60% of it would be water. The rest would be proteins and other cellular materials that need to be hydrated to function. Even bone is about 31% water, if you could chemically remove the water from the structure.
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