Hi there,
so first things first, I am not a modder, but putting this here on behalf of @benjee10. He might be too shy to ask ;-)
The issue seems to be tricky and he does not have the time to try and try.
If you feel this is wrong, tell me and I will close the thread.
Within his habtech2 mod there is this complex duo solar array. For some unknown reason a vehicle including this part will either combust on the launchpad or spawn 1km above the pad, then fall down. This happens in 1.9.