Calulation on price adjustment at the time of trading hours

I have purchased BN 14500 PE @ 29 Yest. High 57 at the time of closing i checked it was 54 . But today morning when i checked iit shows previous close is 44 ? Why there is change in price level ?

Closing price will be calculated based on last 30 minutes weighted average price of that particular contract.

Yesterday BN started falling more during last 15 mins, so even last traded price is higher for that put option closing price will be based on weighted average price of last 30 mins.

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Thanks Siva this strategy is only on options ?

For all securities.