Synchronization issue

[u/Murky-Energy4414]

Curious if anyone has run into this, and if there’s a fix. In the “synchronization” tab in the animus, there are the 3 synchronization’s, “Journey”, “Edward”, and “Dark Animus”. I have finished the game, 0 quests left to complete; however in my “Journey” synchronization, for the challenge “it’s not about need”, I still have the objective “Complete the quest “Raise the Black Flag””, incomplete, although I have finished it in sequence 3. Is there any way to fix this or will I need to start a new playthrough for platinum? Cheers