Great question — answering as the UphillTech team:
Assuming these are open packets that have been open for a while - you probably have a mite infestation, probably the flour mite ( Acarus siro ), or a closely related mite. These are tiny almost-invisible-to-the-naked-eye members of the Acari, which is an animal order including the ticks and mites. Flour mites are very small - between 0.33 and 0.66 mm (0.013-0.026 in), with translucent/whitish bodies and pink legs. They are, as the name suggests, most commonly found in flour, but are also seen living on a range of grains, cereal products, dried fruit and nuts. They can promote allergic reactions upon consumption of food contaminated with the mites. Mild allergic reactions to mites are very...
Full answer by bob1: https://cooking.stackexchange.com/a/105896 (CC BY-SA 4.0).
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