It has nothing to do with the communism government. In your rules.txt you renamed communism tech (cmn) to monarchy and gave it to various civilizations. Remove this tech from their tech-lists and voila, problem solved.
You didn't have to give government techs to your civs: You used the force-government command and forbade government switching, so
You didn't have to give government techs to your civs: You used the force-government command and forbade government switching, so

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