Discrepancy in the Metrics savings and the Apex Chart Savings

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I have been running the apex charts savings for a while (it is my favourite chart!) and I noticed there is a difference between those daily figures for the predbat Savings and the ones in the new Metrics page (which is a great addition imho). The other two figures are the same.

They are shown in the images below

The code for the apex chart configuration is below:-

type: custom:apexcharts-card
header:
show: true
title: Cost Savings
show_states: true
colorize_states: true
graph_span: 8days
span:
start: day
offset: "-7day"
now:
show: true
series:

• entity: predbat.savings_yesterday_predbat
  stroke_width: 1
  name: saving_predbat
  type: column
  group_by:
  func: last
  duration: 24hours
• entity: predbat.savings_yesterday_pvbat
  stroke_width: 1
  name: saving_pvbat
  type: column
  group_by:
  func: last
  duration: 1day
• entity: predbat.cost_yesterday
  stroke_width: 1
  type: column
  name: actual
  group_by:
  func: last
  duration: 1da