Calculated Target Macronutrient carb does not match my tracking (Keto)

Hi…I am a new Gold user onboarding myself slowly. I follow the Keto diet so that is my macro nutrient target as per the calculator which is 40g net carbs which is what I want.

What does not make sense is in that my target macronutrient carb target is 47g and my diary says my carb target is 50g - three different targets.

I have kept all the auto calculated settings in place and not used custom values.

Why would there be variance in terms of what I should be targeting in the tracking?

I have included screenshots.