Percentages in bounce rate graph are miscalculated

[danieljb]

Past Issues Searched

• I have searched open and closed issues to make sure that the bug has not yet been reported

Issue is a Bug Report

• This is a bug report and not a feature request, nor asking for self-hosted support

Using official Plausible Cloud hosting or self-hosting?

Plausible Cloud from plausible.io

Describe the bug

Percentages in the bounce rate graph include extremely high values. It appears like some values are multiplied by 100,000,000, here’s the API response JSON for a bounce rate top stat of 38%:

{
  "imported_source": null,
  "interval": "date",
  "labels": ["2022-08-10", "2022-08-11", "2022-08-12", "2022-08-13", "2022-08-14", "2022-08-15", "2022-08-16"],
  "plot": [0, 100, 4294967271, 0, 0, 80, 50],
  "present_index": 6,
  "with_imported": false
}

When dividing the extreme number 4,294,967,271 / 100,000,000 the resulting average almost corresponds to the top stat shown:

(0 + 100 + (4294967271 / 100000000) + 0 + 0 + 80 + 50) / 7 = 38.9928103871

This only happens on one of four registered websites in our Plausible account. The rest is working as expected.

Expected behavior

Bounce rate values should be between 0 and 100 percent.

Screenshots

Environment

- OS: macOS
- Browser: Firefox
- Browser Version: 103.0

also validated:
- OS: macOS
- Browser: Chrome
- Browser Version: 104.0.5112.79

[duckchip]

I can reproduce this issue when fetching results from the stats/aggregate api endpoint.
It's seems to happen only in a few cases. Out of 8000 requests, we had this problem 7 times.

The value we receive is always 2147483647, which is the MAX value for an INT32

[ukutaht]

Good clues, thank you!