Tried to fix the CoL and CoM, Drag points, wing physics and stuff but nothing worked.
I also noticed some planes (which I didn’t build) have the same problem maybe SimplePlanes is just tweaking???
Also the new light fighter based on the FA-40 Golden eagle that I’m building isn’t really that done I’d say one more month to finish it (I’m busy with school and other things)
It's a problem with connections. There is a good chance that there is something extra on the left side of the aircraft or an extra connection. I am going to assume it's a gun.