Bugging skeletons while export from blender

Does anyone know how to fix this Blender issue? Whenever I export a car from Blender, the skeleton gets messed up. This happens even if I simply import the model and export it again without making any changes. For example, doors may open in the wrong direction or other bones/skeleton parts behave incorrectly. It seems like it could be a Sollumz/Blender export issue, but I have no idea how to fix it. Has anyone had the same problem or knows what could be causing it?