For some reason the motes in the Prophecy dungeon seem to disappear when you pick up 5. I think it's got something to do with getting amplified but I'm not too sure.
EDIT:
Found a clip to explain what I was saying. Not my clip, watch at around 1:30
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#destiny2
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1 ReplyBy disappearing yiu mean you got the note to soak into the glowing parts right?