A program for calculating the strength of the guard on random maps in Heroes of Might and Magic III, called H3CalcGuards.

Was there definitely no resource that was taken from under the shifted guard earlier? If genies guarded not only the Pandora box but also a resource (mercury/sulfur/crystals/dragon stones), then everything would be fine. There is also a theoretical possibility: initially, a Pandora box and, say, an artifact of the Seer worth 5000 experience points were generated in a cluster, and they had a guard. But then the generator tried to place a Seer's hut somewhere and failed. Then it tried to replace the Seer's artifact with something else and failed again. In this case, the Seer's artifact is simply removed without reducing the guard. The same may happen with the Key Master's tent. However, in this case, it is unlikely: the red zone is filled first, and the generator has no reason why it would not be possible to place a Seer's hut (or a reward pillar for the Key Master's tent) somewhere in another zone for the artifact. Apparently, I will have to recheck the entire mechanism.

By the way, what is adv low / adv high? [off] And even the value of their upgraded versions is still less than that of wyverns...[/off]
Did they really appear, and only one city is needed?

Well, I wrote that they determine the minimum number of creatures during generation. That is, the minimum number of Gorgons is much higher than that of Wyverns, which is why Wyverns can appear at lower values. Is there only one city if you count it exactly as described there: http://forum.df2.ru/index.php?s=&showtopic=29068&view=findpost&p=575859?
That is, all the zones that influence this have already been explored, etc.?