Isn't that just a bit crazy? If there's a custom title field in one and a custom title field in the other why wouldn't the upgrade do the obvious thing and put them in the right field? This is going from 7.0.2 to 7.2.2 did the fields change in that leap?
I didn't know the titles were disappearing, not sure how they are being lost, apparently there's a post count sync done without our intervention.
I've been yelled at a few times this morning about them, I'm kicking the dog now. I think I did a backup a few days ago, I'll see if I can find them and manually write them.