Welp, I reported the bug a week ago and my ticket still hasn't been answered so I guess sharing it might make it get noticed.
Taking the OSI(? I think that's the name?) buff on Makeb(click the terminal) and
then taking a flight anywhere else bugs your companion out and sets it to your level. So if you're level 75, your companion is also level 75. It seems to partially bug you out aswell and your base damage/healing of abilities is boosted to your level too.
Goes away when you lose the OSI buff.
I have a few other exploits I'll share if my tickets remain unanswered