the object was sold for a significantly lower price!

Bought by adobestock - expect appearance of your model on Adobe stock for pennies :]
I think you should write directly to support and ask them what the actual f*k had happened? But thanks for escalating this publicly, need to check my sales stats, in case there's similar surprise waiting my attention.

About the buyer under the name (Adobe stock) I have a separate question...
If it's true... then why is my model resold for pennies in other trading platforms? Is it even legal? And what do CGTraider think about this?

I would like to know as well what CGT has to say about this.

That's really weird.
Can you check if your model was downloaded by the same user?
I suspect this may be a purchase of just a few of your renders.

Checked the downloads. this user did not download anything. (maybe you're right, or maybe he just hasn't downloaded the object yet)
Looked again messages... there is no information anywhere that we are talking about any screenshot or render...

screenshot from the letter https://ibb.co/fnVrCWw

I recall that 3-4 years ago, there was a challenge on cgtrader, where participants had to create models for adobe and then those models were put on sale at adobe stock. Maybe that's your case? Did you participate in any challenges on cgtrader in the past? You never know what could be written in their rules and conditions in fine print :]

https://stock.adobe.com/search/3d-assets?load_type=search&native_visual_search=&similar_content_id=&is_recent_search=&search_type=usertyped&k=windmill&asset_id=217960566

Model Holland windmill is on sale by cgtrader for 19,99 euro. Looks suspiciously similar to your model, isn't?

Possibly entered one of these?
(https://www.cgtrader.com/challenges/3d-challenge-abstract-elements#section-terms)

Thus month I also had two similar sales to british buyers for price below the sale price. I think it must be a big question to CGT administration.

Hi,

That is why I don’t like Adobe ! They are so hoodlum... CGTrader signed a contract with them and all challengers de facto too. We can see that CGTrader get around $9.9 for an AdobeStock sell at $19.9 (only 50% of Royalties).

Do you sell many time this model on CGTrader ? If not, I suggest to decrease the price to $19 on CGTrader to tell F**k Y*U to Adobe to decide the price of our work and to take 50% of royalties. And maybe you will sell more your model on CGTrader...

The fact of the matter is that I do not remember that I participated in a similar challenge. Although CGTraider say that I participated. But even in this case, it says about $ 20 and not a word about the fact that I will eventually get only$5.

What good would that do me? The fact that my work is depreciating... it turns out that this is only useful for AdobeStock and CGTraider... This is some nonsense... )

Anyway, I don't like this situation...
Or need to revise the pricing
Or to allow sellers to choose which objects can be sold in this way (and not to choose themselves)... to avoid situations where expensive objects are sold for a penny.
Or I just don't want to participate in such experiments anymore... for objective reasons.

I wrote in support… I don't want to participate in these challenges anymore.
a couple of days waiting for an answer... they haven't answered me yet...

Every time I was interested in a similar competition, I decide to not participate, when I read their terms and conditions.
I can understand giving rights of usage for the winners, which receive prizes, but rights on every participant is a bit too much for my taste.

The answer didn't come... even though I wrote a second letter. Ignoring and silence on the part of technical support.