The same conditions occur on Windows 7 which depends on the Bluetooth unit plugged into the computer. It only appeared for me but only a short time and I don't remember how I solved it though but I do remember it was the first com port that turned out to be the one finally used.
Weird issue but never experienced a problem.
I think the 2 com ports can be bridged to make into a single com port but don't quote me on this. Best for someone else to confirm it.
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