All I can say is that this sounds like nothing I've ever heard of in any of my aircraft, or in MSFS, for that matter. I suspect this is related to hardware or 3rd party bindings, but I know that's not much to go on. If you can't find your problem soon, Just Flight support is far more experienced than I am at diagnosing simulator-level problems, while I specialize in just my own aircraft. Good luck, and let me know what you discover so that anyone in the future with the same problem might be able to find the solution here.