Total fat can include the entire fat molecule (fatty acids + glycerol backbone), but the fatty acid groups (saturated, monounsaturated, polyunsaturated) include only the associated fatty acids. The glycerol component can make up roughly 5% of the total fat, so a typical analysis could have about 5% in the "other fats" component from the glycerol. If your analysis includes more than 5% in the "other fats" category, this may be due to missing values in the fatty acid groups. Saturated fat is a required label nutrient, but mono and poly fat are not, so many manufacturers do not provide mono and poly fat data for their products.
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