`Perc99` lower than `Perc95` and `Perc90`

[nowakmikolaj]

I encountered a problem, it occasionally happens that Perc99 is smaller than Perc95 and Perc90. How is this possible and why does it happen?

Here is serialized StatsSummary object with threads and iterations info:

{
  "Threads": 100,
  "Iterations": 100,
  "FirstTime": "2023-12-07T17:35:01.284Z",
  "EndTime": "2023-12-07T17:36:21.07Z",
  "Samples": { "Total": 10000, "PerSecond": 125.33527185220464 },
  "SampleTime": {
    "Min": "00:00:00.0430000",
    "Max": "00:00:05.8470000",
    "Mean": "00:00:00.7750000",
    "Median": "00:00:00.8580000",
    "Perc90": "00:00:02.4550000",
    "Perc95": "00:00:02.7660000",
    "Perc99": "00:00:01.6390000"
  },
  "ErrorsCount": 0,
  "SampleTimePercentile99": "00:00:01.6390000",
  "ReceivedBytes": { "Total": 3770000, "PerSecond": 47251.39748828115 },
  "SentBytes": { "Total": 4890000, "PerSecond": 61288.94793572807 }
}