Nice!! I'm confused as to how xmp would cause gpu memory instability but I've learned not to argue with weirdness when it comes to odd computer issues lately lol.
On the latter, that's a bug caused by carrying over an old save. To compensate for now until you make a new one: cm in the console, click the dev block icon up top, acquire a Ticket stack, prob tier 5, and read/turn them in until you get to your previous progression. The bug will likely happen again though in that same save. Won't happen in a new one though, or shouldnt.