[AnomalyDetection] ExpectedRange higher than expected?

[lisahua]

System information

• OS version/distro:
• .NET Version (eg., dotnet --info): master

Issue

• What did you do? I apply anomaly detection with csv file below
• What happened? Expected the expectedRange around 30K-40K, yet it's >50K.
• What did you expect? same above
  

Please assign the issue to: https://github.com/guinao and https://github.com/mengaims

Source code / logs

            var anomalyDetectorOptions = new SrCnnEntireAnomalyDetectorOptions()
            {
                DetectMode = //WithMargin,
                Sensitivity = 84,
                DeseasonalityMode = SrCnnDeseasonalityMode.Median,
                Period = -1,
                Threshold =0.12,
            };

            anomalyResult = this.mlContext.AnomalyDetection.DetectEntireAnomalyBySrCnn(
...
            anomalyDetectorOptions);

Input data:
Value,Date
39800,2020-01-01 00:00:00
35000,2020-02-01 00:00:00
35600,2020-03-01 00:00:00
31700,2020-04-01 00:00:00
34900,2020-05-01 00:00:00
35200,2020-06-01 00:00:00
38900,2020-07-01 00:00:00
63981,2020-08-01 00:00:00
42000,2020-09-01 00:00:00
39400,2020-10-01 00:00:00
33700,2020-11-01 00:00:00
37800,2020-12-01 00:00:00
34200,2021-01-01 00:00:00

[michaelgsharp]

@guinao can you take a look at this?