BankNifty OI value mismatching

Hi, I am trying to fetch Bank Nifty Option chain data. I have tried using historical data and via Ticker. But the problem is that I am not getting the data that is shown in NSE website ( There is a huge mismatch. For example - If I fetch the BANKNIFTY 32000 CE Jan, 2021 through historical data on 22nd Jan, 2021it is returning 294175 as OI at 9:15 in 1 minute candle. But if you open NSE option chain Data ( you will never find such a big value throughout the day. Same thing is happening with the ticker also. The OI value API is returning is not matching with NSE website. Please help. I want those OI data.
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