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It could be a data entry error. Since users enter the data there's a lot of wildly inaccurate entries. When I'm having trouble getting a real answer on the app I Google the foods' nutritional value or check the label if it's a packaged food and look for an entry that corresponds. If you're a premium member you can use the data you've researched to create an accurate entry yourself.
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My thoughts are that it accounts for absorbed water when cooking. I always weigh my veg before cooking and count the carbs for raw weight. I find after I've steamed my portion of cauliflower that the weight has increased. An identical weight of cooked cauliflower would also contain a percentage of water and less cauliflower per gram of weight. 2 gram of carb does seem a big difference though - I've recently changed my setting on CM to read decimal values, as it was rounding carbs up before, and this has made quite a difference to my carb count 馃槉