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Data Mismatch

I just joined this awesome platform and I was just getting started with simple notebook to print out closing prices for SPY on Jan,3rd,2019 and Jan, 4th,2019. The returned close prices reported are
2019-01-03 00:00:00+00:00 244.13
2019-01-04 00:00:00+00:00 252.45
Freq: C, Name: Equity(8554 [SPY]), dtype: float64

However, when I look at closing prices in data portals and charting softwares, the closing prices are 244.21 and 252.39 respectively.
Does anybody know what is causing this discrepancy?