So I’m not sure exactly what conditions might have brought this about, because it’s been quite a while since I’ve checked on the Gate of the Gods, but I can say with full certainty that I’ve never, ever ever fought T’mere M’rgo even a single time.
This was a bug from Early Access that has since been fixed, but the kill count couldn’t be fixed retroactively, so you will always have those kills.
Sick! I’m a beastly God of Fusion slaying machine!