Ah, sorry you've encountered that one too! It relates to an internal simulator rounding error that has been with us for years now. You can read about it here. Luckily, there is a solution, but it's nothing that I can tell you how to do quickly. If you would like, I can provide you a file that should be a drop-in replacement. I just can't do it over the forums, so you will have to get in touch with Just Flight support, and then they can send you the file. Just create a ticket and let them know that I sent you. Sorry for the inconvenience! I will include this fix in the next updates for all my aircraft.