Yeah - it is exactly that, boosted to lvl 50 - ran the KOTFE campaign up until Lana romance - finished the chapter, skipped to onslaught and it deleted the romance even though I had already locked in. Think because I didn't finish the whole story line it re wrote everything I had actually done. I find that quite ironic considering the support team say they can't overwrite anything but I literally overwrote my own locked in decisions myself XD Your replies are really good btw, been reading them for ages without posting.

I got a similar bug! I initiated romance with Lana - got the message box and accepted after speaking to her privately. Then I checked the character description for Lana to check for the relationship status - it was there until I finished the chapter and now it is gone! And I haven't had any romantic dialogue Qs since!