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Calculation error in SPC Toolkit for Rule 4 run length?

Hello,

 

My LabVIEW version is 2019.

I am using the LabVIEW Datalogging and Supervisory Control Module for SPC as a Demo Version. Specifically, I am using the Rule Checker (Nelson).vi and I am encountering some strange behavior of the run length calculation of Rule 4. The description of the rule says it reports an error after fourteen points in a row alternating up and down, but I my tests the Test gets flagged after a run length of 12. Is this a known error in this module? Or is my understanding of this rule wrong?

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