Can't change calorie content on a single item

Up until this morning I was able to enter a single food and change the calorie content if I could not find that food exactly. Now when I change the calorie count it also changes the serving size. What's going on?? So in other words if I have 2 cups of coffee and want to enter '0' calories - it changes the amount of servings to '0' as well. Help?

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