6. Fair Play
The most important point: players must play fairly and respect each other. It is forbidden to use cheat codes and all sorts of "bugs."
1.3. Selling artifacts at inflated prices
A well-known bug related to the incorrect operation of the program, where after selling an artifact, it is possible to move other artifacts in the hero's backpack using the arrow keys, while the possible selling price remains unchanged. Consequently, after selling an expensive artifact, the player has the opportunity to deliberately sell cheap artifacts at an inflated price.
Therefore: selling at an inflated price is a violation of the rules, as it is the use of a bug.
It is possible to sell at the normal price (if nothing is shuffled in the backpack), and
there is nothing else needed in the rules, otherwise you would have to do this for every bug.
However, it would be a good idea to add a link in the rules to FizMiG with a list of bugs