Orville redenbacher kettle corn question?

Ok so I was just at the grocery store ad I picked up kettle corn. The 4 mini bags had a calorie count of 200 per bag but te 3 normal sized is 30 calories per cup popped. There r 2.5 servings so that's 75 calories per bag. How can the smaller bags have more calories? And I looked on the box the bigger 3 bags are the same kettle corn not reduced fat or anything. I'm so curious !