As in the title, it looks like title system has stopped updating and tracking progress, at least for the quest titles, not sure about others. Some screenshots for proof:
Some early game title I've obtained already, now it doesn't show the quests as completed
A quest chain I've completed today, last quest was completed after the maintenance. None of the quests are marked as completed, and I did not obtain the title. Pressing Check does nothing to fix this.

