Sorry for the lack of screenshots, but this happened years ago and all the files for this are long gone. I also don't know if this is really "gone wrong" but I remember trying to make dragons an intelligent playable race. The "problem/success" started when I didn't take their megabeast tag away so the entire civilization was prone to go on genocidal rampages resulting in every dragon city being an eternal death arena with tens of thousands of kills happening per century.
The zenith of it occurred when I looked at the dragon civ's king in legends.
The king of dragons in a 500 year old world was a vampire, the king since about year 20, was being worshipped as a god by virtually all civilizations and had a personal kill count of over 50,000. Five thousand of those kills were other dragons, most in the city that was the capital he ruled from.
I looked at his family and discovered the badassery didn't end with him. Prior to becoming a vampire he had about 12 kids in the 50 or so years he was still "mortal," one of which who continued to survive into the age of 400 was also being worshiped by multiple civs with a kill count somewhere in the thousands. His wife left him a few years after he became a vampire and spent the next 400 years roaming the wilderness hunting almost exclusively giant animals in savage biomes.
The cherry on top was his name. It was something like Amok or Arnok, whatever it was I remember it was disturbingly close to Armok. A single tag oversight had apparently created the second cousin of Armok.