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I'm not sure if I understand your query correctly. Do you mean to say that a single list cannot be integrated on different forms? If so, I've tried integrating the same list with 2 different forms and I was able to integrate without any issue. The other lists are also displayed normally.
Do you see any error message while trying to integrate with the same list of Getresponse? Could you provide us with the screenshot of the issue so that we can investigate the issue further?
If you are referring to something different or need any further assistance, please let us know. We will be happy to assist.