We fill our jars based on volume instead of weight. All powders have a different density, so this is why some of your 0.5 oz jars appear overfilled, since we fill by volume some of the pigments/glitters take up more space resulting in an "over filled" jar. Our jars do not have a weight of 0.5 oz, 1 oz. or 2 oz., but rather a fluid ounce of volume. For example, our 1 oz. jars do not have a weight of 1 oz., but rather have 1 fluid oz. of volume.