It really looks like your mixer being at fault if its behaving the same on multiple computers. I did a google search, and cant really find that many similar problems to yours, which might point towards a driver issue rather than hardware. There is talk of some beta drivers fixing some issues, but youll need to contact A&H for that.
The upshot is, that this isnt a Traktor problem, so youre likely going to have to raise a support ticket with A&H, or take it back to the shop and try another one.
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