Mismatch/variation in volume/prices when refreshing charts on the desktop browser.

I have been using Zerodha desktop client to analyze trades. However I observed descripancy in output from Zerodha graph for 15 minutes chart. I tried to load https://kite.zerodha.com/chart/web/ciq/NFO-FUT/NIFTY19JULFUT/11870210 at the end of day (10:30 PM) and volumes to be different every time I refresh.
An example call that I got from firebug:

When I refresh the volume flips between: 746550 & 743775 almost every time. Can you please help? This leads to change in some of the indicators I was using on every refresh.

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