Wow thanks I was honestly just playing around and putting parts in different places thanks for the help though I will try to make a new plane that actually works so thanks for the help

You problems stem from the two cockpits. The game wants to center the airplane down along one cockpit and when you try to mirror it with two like this it ends up making multiple extra parts, and it throws off the center of mass, lift and pretty much everything else.

This can be fixed by taking the plane apart, getting rid of the extra parts, and reassembling it, but even if you do that, it's still going to fly off center, since it will treat once cockpit as the centerline.

Your best solution is to set it up with one cockpit right down the centerline. You could nudge one to center with the "Rotate Parts" tools, or just make the airplane an odd number of blocks wide.