did U claim the previous reward for 3.1.2 after U finished 3.1.3. If so then it didn't count as the game was still on 3.1.2s challenge.
I'm starting a new account challenge, and I'm order to get a 3* Wong, I need to do 3.1.3. Which I already did. Don't know if I need to 100% it, or just a bug.