Values wrong with grouping by hour to show max value

[wizbowes]

I have a graph showing hourly rainfall. However sometimes the bars don't match the underlying data.

Here's the yaml:

type: custom:mini-graph-card
icon: mdi:weather-rainy
name: Hourly Rainfall
hours_to_show: 24
points_per_hour: 1
group_by: hour
aggregate_func: max
show:
  graph: bar
  fill: true
  icon: false
color_thresholds:
  - value: 12
    color: '#030ffc'
  - value: 7
    color: '#353ffc'
  - value: 5
    color: '#656dfc'
  - value: 3
    color: '#979dfc'
  - value: 1
    color: '#afb3fa'
  - value: 0
    color: '#ffffff'
entities:
  - entity: sensor.rainfall_hour
    state_adaptive_color: false

Here's the current output - as you can see the last hour with data is showing 1.5mm rain

However in the raw data you can see that it should be 0.5mm

Home Assistant 2023.10.3
Frontend 20231005.0 - latest
Mini-Graph: v0.11.0

[lowson]

I also have issues with group_by: hour but using aggregate_func: diff

My source is a Helper Utility Meter that resets daily.

It seems like the usage only shows when there is 2 or more recording changes within an hour, it's not diffing the 0 -> 1 within any hour.

Here's the yaml:

type: custom:mini-graph-card
icon: mdi:gas-burner
entities:
  - sensor.gas_daily
name: Gas
line_color: Orange
group_by: hour
line_width: 8
font_size: 75
hours_to_show: 24
unit: m3
points_per_hour: 1
aggregate_func: diff
show:
  graph: bar

Delta also does the something no different