Reason for discrepancies between Cronometer data and Cronometer-written HealthKid data?

Why the discrepancies between Cronometer native data and Cronometer-written Apple HealthKit data. For instance, I logged the following carbohydrates net intakes:

70 g Soft Pretzel, Salted: 48.5 g
0.67 outer leaf - large - 24 g Lettuce, Green Leaf: 0.4 g
100 g Beef, cured, smoked, chopped: 1.9 g

In Apple HealthKit, the following values were written by Cronometer:

49.7 g
0.65 g
1.9 g