It just dawned on me that you may be using a measuring cup intended for measuring liquids to measure dry ingredients, based on the photo in Reply 11 in this thread. If so, you should be aware that you should not use measuring cups specifically designed for measuring liquids for measuring dry ingredients. Several years ago, Cook's Illustrated discussed this topic. I have copied and pasted their report on this subject below:
Published September 1, 1994.
Can wet and dry measuring cups be used interchangeably?
Do you really need to use both dry and wet measuring cups? Yes.
We first tested sugar and flour, measuring them into dry cups (made from metal and plastic and capable of being leveled off) and then dumping them into wet measures — glass and clear plastic containers marked with ounces and cups. The dry ingredients came up short in the wet measures, and it was impossible to level off and accurately gauge how much sugar or flour was in a wet measure. Essentially, when you pour a liquid into a container it flows down into every crevice, leaving no spaces, not even microscopic ones. But granulated solids can settle unpredictably, depending on the shape and size of the grains and of the container into which they are poured. When poured into a wide container, the grains can spread out and settle down more tightly than when they are stacked up in a narrow container. When settled more densely, they occupy less volume, so that the same amount of sugar will actually occupy less volume in a wide container than in a narrow one.
The bottom line? Dry ingredients must be measured in cups specifically designed for dry measures.
We then measured varying amounts of water in wet measures and then transferred the water to the appropriate dry measures. Here, the amounts were the same. However, we generally find wet measures easier to work with since they need not be filled to the rim. Liquids filled to the rim are easy to spill while being carried to a bowl or pot.
And what about "half-way" ingredients like yogurt and sour cream? We weighed out eight ounces of yogurt and found that it fit perfectly into a one-cup dry measure. However, in a wet measure it fell below the one-cup line. It also was harder to gauge how much yogurt was actually in the glass measuring cup, so we recommend measuring yogurt, sour cream, and other semi-solid ingredients in dry measures.