Why do the individual fats, when added together, not equal the total fat in grams?

I am looking at the Lipids chart in the Diary and do not understand why the individual fats do not add up to equal the total fat in grams. I have set the daily targets and the maximum thresholds as follows...
Fat 60 g; 66 g
Monounsaturated 30 g; 30 g
Polyunsaturated 15 g; 15 g
Omega 3 1.1 g
Omega 6 11 g
Saturated 15 g; 15 g
Trans-Fats 0 g; 0 g
Cholesterol 200 mg; 200 mg
Phytosterol - mg; - mg

After entering the food choices, I added the number of each individual fat together and see that they do not equal the total fat in grams. for example... The total fat is 55.5 grams, but the Monounsaturated, Polyunsaturated, Saturated and Trans-Fats added together is 47.6 grams, as shown below. Will one of Cronometer's experts please tell me why?

Fat 55.5 g
Monounsaturated 22.3 g
Polyunsaturated 11.6
Omega 3 1.2 g
Omega 6 9.8 g
Saturated 13.3 g
Trans-Fats 0.4 g
Cholesterol 154.7 mg
Phytosterol - mg

Thank you very much.

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