Pivot Calculation

gmax
I am seeing some difference in pivot points calculated manually and in zerodha chart. Can anyone help ?

Bank Nifty -> BANKNIFTY18FEBFUT
Date : 29-01-2018

Pivot point (PP) = (High + Low + Close) / 3
First resistance (R1) = (2 x PP) – Low
but there is a difference in R1 in the chart
High: 27637.35
Low : 27170
Close : 27374.25

So Pivot should be as per formula - 27393.8
R1 as per formula - 27617

Pivot in chart - 27385
R1 in chart - 27597
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