difference in ATR values in KITE3 & PI CHART

why there isdifference in Day’s ATR (14) in equities. for eg.:
in SBIN EQ case
in Kite3: day’s ATR for 06.02.18 is 9.87
in Pi chart: day’s ATR for 06.02.18 is 11.95.
That’s a huge difference for Day wise ATR of any stock.
kindly rectify the same .

I have explained this in detail here. You should check this out