Wave-y pattern on MacBook air, not on Mac Pro

I’m seeing some weird behavior when I connect my device to a MacBook Air. I tried with 2 different MacBook Airs, an old one with regular USB, and a new one with USB-c. When I record a session, I get a wave-y pattern on both connected channels (0 and 1) - see attached picture. This is not accurate. Both of these channels should be a constant 0V. Logic2 on my Mac Pro shows the results correctly (constant 0V). I’m new to Saleae and I have no idea how to troubleshoot this. Any help to point me in the right direction would be greatly appreciated.

The logic2 sw version on both MacBook airs is 2.3.45. The version on my mac pro is 2.3.24.

clearly newbie mistake. Forgot to connect the two ground wires. Interesting though that this only caused issues on the Air, and not on the Pro. Anyways, problem solved.

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