I've had my triumphs completed for a while now, but just noticed the character I thought had the 20 golden chests is missing one on the moon, even though I thought I'd collected them all and my triumph shows 20/20....
The bungie FAQ even states they recommend getting all 20 on one character:
Q: I have found all Golden Chests on all planets, but my Triumph tally isnt counting them
A: We advise finding all 20 chests on a single character. You have the ability to check your progress in game, under the director, by planet. Please note, deleting a character could result in a loss of progress.
Anyone else had something like this?