So, previous issue was fixed, just fine. It turns out I'm just stupid. But there's a new issue, that I don't think is related me being me.
The first minute or so is me demonstrating the glitch, what it does and it fixing itself with no apparent provocation. The last few minutes are me retrieving Jebediah.
This occurred after trying to land on an asteroid, sending me on an accelerating course across the Kerbol system and leaving the asteroid spinning at a massive rate. My acceleration eventually slowed down after reaching about 9km/s relative to target. This has happened before, where I have been sent away from the asteroid and the asteroid started spinning, but the glitch I am referring to here didn't occur. As shown in the video, it fixed itself, but I am wondering if it will happen again, if it's preventable on my end or if you can fix it.