Day Trading Stocks & Futures

We can see Open Interest (OI) in Nifty futures increasing by 8% with increasing volume in a short term bear market. This should indicate a further decline in Nifty. Put Call ratio in volume is only 0.64 also indicating that Put writers are unwilling to sell more Puts expecting a decline. What is confusing me is why there is a significant amount of OI at 10500 strike in Puts and why was there a significant addition of OI as well at this level
 

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