Differentiating between multiple overworld worlds

Hello, I have a PaperMC minecraft server with multiple worlds of the overworld type (some build worlds, survival and some testing worlds). The mod combines all these worlds to me except for one. So four worlds share the chunks, but one doesnt. Does anyone know how to make all of them separate, so i dont have chunks from the surival world in a superflat build world. Thanks for help,

Solution:

multiverse support should have prevented this. try editing your multiverse support number

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