I visit the seller's store today, and test another scale/balance, a identical model, and it behave the same way. Indeed the attendent found the behavior of the balance weird.
It's probably a design problem, since all models behave like that.
But I still can use. I just need to use a piece of paper of 1g over the sensor, to add things that weight things bellow 0,5g, and subtract 1g of the final total weight. Not that bad, considering it was cheap.
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