Each macro etc is measured "per 100g" or at least this is implied because it says "100 g" below each item (not per 100g which would be clearer).

However, when I modify the serving size at the top, all the values update. How could this be? Changing a serving size does not change how many grams of fat per 100g, it just changes the total consumed.

Also, the first field asks how many calories, but does not specify for how much food. Is it for one serving or for 100g?

I have edited the same protein bar THREE TIMES now and every time it comes out wrong. I don't understand how anyone is using this form.