Hello,
I went to check on the triumph and it appears I only have 13 of the chests identified. I visited every single chest location multiple times, using several third-party guides and there are no chests at those locations. My chest count on my Warlock adds up to 16 according to the director, but the website shows 13. I can not progress any more and it is driving me nuts.
Edit: The chests do not appear for any of my characters.
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I am still having this problem.
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Picking up all 20 chests on an alternate character typically fixes and updates the triumph when this occurs.