Tresclub: On 11-16, I leveled up to 110. Even got the congratulatory screen that said leveling up yo 110; however, the next time I loaded the game, it shows me starch ng all over at 109.
???
This bug may be literally a decade old - I think I had it once, too.
From that experience and multiple mentionings here, it might only be settled at the next level, 111 for you. Just pile up some 255,000 XPs more.
Good for you, there's nothing waiting for you at L110...
Have fun!