Hey there, it appears that Xur's strange coin buff is taking up a quest slot, and is not clearing after it expires. Bungie are aware, even if it is not in the known issues list.
Does that sound like what could have happened to you?
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oh you'r right, i do have the buff and i took it each week on my Titan, and the number of time i took it is 5 time, and it's the number of slot i miss, thanks for the clarification.
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No problem.