59 mcg of Bristle Berry

This might be the same issue as described in

The thread is about storage compactors though, which got quickly fixed in one of the following hotfixes (if i am not mistaken). It might be that klei forgot to tend to the fridges as well.

 

The problem is most likely that small amounts of your food are decaying thus creating delivery errands for that small amounts. Once the delivery is made, new food as decayed.

The solution until a hotfix arrives would be to place your fridges in a room of sterile gas (chlorine or co2 (maybe hydrogen as well)).

I've had the exact same issue; Indeed seems as fridges aren't fixed.

Save file attached

Aiur On.sav

It is not only about the fridge. 

The bug is easily reproducible with omelette cooking. At some point (very frequently), dupes start carrying weird tiny amounts of raw egg to the cooking station. The bug also occurs randomly when dupes deliver foods to fridges/storages. Also happens to other resources, but I don't know how to reproduce the bug with other items.