It sounds like you've just been unlucky. I've received a few exotic engrams myself.
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Were you first place though?
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I received a Primary Exotic Engram from Third Place. Just RNG. Make sure you don't activate them too quickly though. Try waiting about 5-10 minutes after one dissapears.
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Doesn't it up the chance of receiving an exotic after not getting one?
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Guess i'm just unlucky than.