Extra parts compound issue

I'm running into an issue when trying to set up lods for certain extra parts. When I leave them uncompounded, the vehicle spawns and functions fine. But as soon as I make either a compound and try to spawn the vehicle in game, I end up with this: 

I've been searching through topics of similar issues, but none of those solutions have worked. I've tried resetting the chassis and base dummys like it says in other topics, and checking the hierarchy, there are no duplicate name conflicts, but nothing worked. After I get this result I can dismiss the compound, export again, and the model will be fine. So it seems to me that it is definitely something from making the extras a compound. I initially thought this was limited to extras 5 and 6, but after changing one to extra_11 and compounding, I still ended up with the same result.