This sounds similar to something I used to experience when I was first dialing in my controls setup.
For example, when I was monkeying with setting up toe brakes for Axis planes, I soon realized my accidentally pressing the toe brakes just a little on my CH rudder pedals was sending a duplicate command I had mapped to a different command.
It can be a pain to track down conflicting commands mapped to different keys, but if you've programmed something like "alt" or "option" clicks to do certain things, and one command ends up affecting the other, then you get odd things happening when two keys are pressed at the same time.
Charlo
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