Meaning of Total carbs in iOS app.

I am really confused. What does total carbs in the app food diary mean? I tried entering this for a food in ‘My Foods’

Carbs 15.4g
sugars 1.4g
fibre 7g

but when I save the entry it changes it to

carbs 8.4g
sugars 1.4g
fibre 7g

why is it removing 7g from total carbs? If it was called net carbs I’d understand but it’s called total carbs.

when I check my entry on the website it just says

Carbs 15.4g
sugars 1.4g
fibre 7g

so it’s saving what I’m entering but displaying something in the app that I can’t get my head around….
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