The total of a pivot table does not match to a bar chart using Google Analytics Data

I have a pivot table with :

  • row dimension: Channel
  • column dimension: Date
  • Metric: AUT(Sessions)

I have a bar chart with:

  • Dimension: Date
  • Metric: AUT(Sessions)

The totals do not match but they have the same filters and same fields. How can I make the totals match?