Understanding Data Discrepancies in Page Views Across Filters

Hi Team, I'm seeing minor discrepancy of data while using different filters. I created two different charts using similar properties

Ideally in both cases, the total of the events should be same, but there is a minor discrepancy in total number of events, I know discrepancy is very small, but still want to understand why there is a discrepancy, so that we're aware that till what level error we can face and reasons for it Please refer attached screenshots