Hey Jade, I just found a weird bug on this. First time I've had a bug like this with OPT, which I have been using since 1.2. In my new career game in GPP, the OPT J Inline Large Docking Port causes my spaceplane to start 1,000 meters above the runway. No idea why. I looked through the config, but didn't see anything that should cause it. I tested the standard Inline Docking Port and the Inline Boarding Ramp and neither of them cause it. Let me know if you need any details or if there is anything I can do to assist in troubleshooting.
Thanks in advanced.