Try joining a friend whose currently tracking a different quest and change your own tracked quest to a different one, please.

If it does not work, then in the game's menu, go to Play / Play Campaign and select the Advanced option indicated below the window with your save files. Then,  choose a quest or two before the one where the issue occurred and  progress as normal.

In addition, always remember to keep your game and your platform's software up-to-date!