Seems like a bug in calculation?

[Jerryxe]

I don't know if this is a bug or something.

I have a gas meter sensor that gets reading every few minutes using rtl-433 (not constant interval). I set up since last night ~10PM, so I have these readings since last night:

• 10.25PM, 84,170
• 10:40PM, 84,172
• 11:15PM, 84,174
• 6:50AM, 84,176
• 7:30AM, 84,178
• 8:40AM, 84,180
• 9:45AM, 84,182
• 10:20AM, 84,184
• 11AM, 84,186
• 11:55AM, 84,188

Now is 2:55PM

So I expect below code to report usage of 18 (=84,188 - 84,170) for the last 24 hours. However with the 24 hours hourly bar chart, it only has 2 bars with data, each has 2 usage, so total only 4 (instead of 18).

If I remove "points_per_hour: 1", I will get 4 bars each with 2 usage, so total 8, still less than 18.

And if I switch to line chart, I am surprised to see a data point of 84,171! But all my records have even numbers, no odd numbers.

What am I doing wrong here?