This isn't about pumpkin, but about how to properly measure flour.
Measuring flour properly will really improve your baking. We are all taught to scoop and level, but this usually amounts about 25% more flour than is truly needed. This will make your recipes dense and sometimes floury or chalky.
Instead, I learned from my research that you should spoon your flour into your cups. Don't compact it down. Just lightly spoon in and then level off.
But an even better way to measure flour is by weight. Some recipes, such as on the joyofbaking.com, call for a certain weight. But I have found that using the spooning method works very well.
For even more information see this link: