Only three "creatures" from my website had issues?!
• Tormentor 297 and Maenad 443 - RTMG can't check it, it crashes with a critical error. I haven't fixed it yet; I'll look at it manually.
• Summoner 454, Greater Summoner 455, and Battle Summoner 456 - RTMG doesn't like that the and <base creature> fields contain the names of NCF creatures, which are assigned to them by script, rather than numbers (like CREATURE_455).
• Asker 440, Turgak 458, and Gaplan 459 - they also don't like names instead of numbers in upgrades and the base creature.
I haven't checked how names instead of numbers work in the game; I just changed the values. It might be normal.