Difference in Entry price

I went long a Nifty Future two days back (Aug 23) at an entry price of 17492.2500 as my records 

and also as per per your contract note.

Till yesterday, the entry price showed correctly but today the entry price has moved higher to

17585.55.

 

This seems to me a discrepancy. Why should my entry price increase by more than 93 points.

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