NSE data Confusion

Hi Guru's,

I am bit confused with NSE. Pls. help me in understanding data. NSE data is confusing for me.
1. https://www.nseindia.com/market-data/oi-spurts says that MFSL chg in OI is 540 which is 50.66%

Now confusion begins:
as per https://www.nseindia.com/get-quotes/derivatives?symbol=MFSL
Chg in OI for APR/MAY/JUNE is 484/33/0 =517 which is not 540
as per nseoi file downloaded from https://archives.nseindia.com/archives/nsccl/mwpl/nseoi_24042020.zip it is
Current OI 2208700 Prev OI 1427400 CHg % 0.547359 Change in OI in lots 601

And this can be found in many scrips like tatapower.

So Guru's pls guide which one to follow as same source is not giving same info

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