BeeX - Your problem has nothing to do with the scale.
The spoons were calibrated using one batch of powder. Each batch of powder has a different density and therefore will weigh out differently. Every time you change the powder batch you have to recalibrate your spoons.
You can check the accuracy of your scale by getting a set of calibration weigths.
Spoons typically will drop light that is why they sell powder tricklers!
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