Banknifty spot and Banknifty futures divergence (premium)

Why so much divergence in Bank nifty spot and banknifty November 2018 series? for ex. on 21 Nov BNF spot closed at 26262 while Nov 2018 futures closed at 26339, a 80 point difference- similarly, on 13th Nov there was a difference of 62 points.
What could be explanation?

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Europe and USA Markets sideways going down . BUT banknifty in india going up everyday !
Am i missing something , to understand ?