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Interference from the AO to the AI of a PCI 6251

I have the following problem: I am generating an analog signal out from the first analog out of the PCI 6251 board. I connect this signal directly to the first channel of the AI of the card. I then plot AI channel 1,2,3 and the AO channel. What I see is that even when input channel 2,3 are not connected they show me the same trace as that recorded from the AI-1 channel. How is this possible ? Cheers, BSG.
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What you are seeing is ghosting, see

https://knowledge.ni.com/KnowledgeArticleDetails?id=kA03q000000YHy6CAG&l=en-US

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"It’s the questions that drive us.”
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