You've got so many additional plugins, you should first suspect one of them (or maybe a combination of them).
You should disable some of them and observe what happens. This can be done via x-plane plugin menu.
If you can't find the culprit, you should start from a clean copy of x-plane and install your favourite plugins one by one until you see the problem appear again. I'm not sure if and how you can install a second copy of X-plane via Steam.
Once you've found the culprit, you should directly contact its developer. This forum is mainly for X-plane default install.
All the best with that,
Guillaume AMELINE (not affiliated with Laminar Research)