Volume does not match on different Yahoo pages
Why is it that the main landing page for any ticker (for example ^GSPC the S&P 500 Index) shows a volume figure for April 17th as 3,554,592,893 whereas if you click "Historical Data" and view that page, it shows the April 17 volume as 5,792,140,000. It seems every ticker has a small to large difference depending on which of these two pages you look at. Landing summary page vs. Historical Data page. Why are they always different? (Thisexample for April 17th was noted on Sunday April 19, 9:16PM Central, but the variances exist every night).
as of July 6 2020 10pm EDT ^GSPC show incorrect volume information on the historical data tab. nearly double.