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I'm not sure if it's the scripts or what, but in some of my projects, whenever I talk to one of the characters, the event keeps repeating. I've included a demo for testing. Thanks!
The problem exists in 'SDK Part I II III IV' of your scripts. I removed all the dependents from it first to make sure it wasn't in the Beastiary thing or the Stealing System. It still acts as a looping window message. It wasn't until I removed 'SDK Part I II III IV' that it stopped. I have no idea why. I wouldn't know where to begin. So I'm sorry for not being much help in that area. However you should try to acquire help from someone more knowledgeable on the SDK.