Mark quest in "Ancient Era" after completed all quests

Anyone else has this quest marker left in the ancient era? (As far as I know I’ve completed every main and Sidequest, I’m also in empowered Monoliths). How do I remove this mark? Is it a bug?? If i pass the mouse not show the name of quest.

That is a visual bug. Been around for a long time. Basically, it’s related to the monolith quests. Each one gets a marker in the corresponding timeline.
Once you finish the monolith quests, they go away.

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