Gluten is a protein found in the cereals, wheat (therefore bread), rye and barley. Enzymes in the gut break down this and other proteins into single amino acids, or small di- or tri- amino acids Carbohydrates are also found in cereals, wheat (therefore bread), rye and barley and are broken down into glucose.
Carbs and gluten are very different substances, carbohydrates consist of sugar, while gluten is a group of proteins.
Low/no Gluten is not equal to low carb, they're different things and you should not be surprised at the results you observed.
I've been looking at UGG breads, not sure if I was to fork out the money, although I've now found cheapest to be #5.79 at Hawthorn Health. .Carbohydrates 7.6 g; of which Sugars 1.4g, per 100 gms. Not perfect but better than most breads.
Might give it a go.