As far as I recall, this is in fact a glitch that Bungie was looking into. However, it is not really a problem, as the weapon can be obtained on your other characters using the collections once a single character has obtained it.
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Yeah, I know, I was just surprised, normally I do the same quest a season later on my other character to get a max-level one, so this is the first time I have completed the same exotic quest in the same season with 3 characters. Was surprised and would have loved the extra 14 shards after pumping most of mine in to the ju-ju quest.