I noticed in the variables file the old titles are set to default = 0 where the new ones are not, don't know if this is where the problem with titles stems from.
With Lani's exp, it seems she was set to lev 1 and exp set zero, but the amount needed to get to lev 2 is still the amount she would have needed to get to the next lev in the previous rewind, lev 4 or 5 I believe, only this time it wants that amount to get to lev 1.
Another bug I found is if you don't unequip things from Lani, then buy them in the next rewind then try and equip them, it will tell you they are equipped to Lani and the only way to unequip them is to add her to your party and do so.
Hate bugs, I can see how they can tie up so much of your time you cant advance the story line, bummer.