In the UK food is labelled as below... as you can see fibre is not connected to Carbs in the labelling which means it does not get deducted from the Carb totals.
Nutrition Information Nutrient Per 100g
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Energy 404.6KJ/97Kcal [/FONT][/FONT]
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Protein 63.0g [/FONT][/FONT]
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Carbohydrate 9.6g [/FONT][/FONT]
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of which sugars 2.0g [/FONT][/FONT]
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starch 7.7g [/FONT][/FONT]
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Fat 3.6g [/FONT][/FONT]
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of which saturates 1.3g [/FONT][/FONT]
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mono-saturates 1.4g [/FONT][/FONT]
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polysatuarates 0.7g [/FONT][/FONT]
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Fibre 1.6g [/FONT][/FONT]
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sodium 0.2g [/FONT][/FONT]
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salt 0.5g [/FONT][/FONT]
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Whereas in the US food is labelled as where the fibre is included as part of the carb content & therefore means it should be deducted to get your total carb count.[/FONT]
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As far as I'm aware a food cannot have a negative carb value.[/FONT]
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Hope this helps clarify some doubts. xx[/FONT]