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The issue is that Fortress creatures have a bug with the distribution of adv low / adv high creatures. Specifically, for Gorgons, it's 12 and 25 (for all normal level 5 creatures, it's 10 and 16). The minimum average number of creatures that can be is approximately (adv low + adv high)/2. For Gorgons, this comes out to about 18. At the same time, Gorgons have a fairly high AI Value. So, it's not surprising that they are generated only for quite valuable guards, more valuable than enough for Wyverns.
Or, perhaps, Gorgons appeared, but they are not in the list? If so, it's possible that the map has a different number of zones with a native city dwelling than was entered into the program. In addition, the resource can be either a specific resource or a random resource - it is impossible to distinguish them in the game, and they have different values.
Or, perhaps, Gorgons appeared, but they are not in the list? If so, it's possible that the map has a different number of zones with a native city dwelling than was entered into the program. In addition, the resource can be either a specific resource or a random resource - it is impossible to distinguish them in the game, and they have different values.