Schedule Ship Date incorrectly populated - post transformation rule

Summary:

Hi Team,

In our Business, we do Not use GOP and the SSD & SAD is populated based on a Simple Post transformation rule. It works all the time, however for this particular SO#199118, I notice discrepancy in the SSD

SO Requested Date : 08/12/21

Ideally the SSD and SAD should be 08/12/21, however for SO#199118 ( POD: EPSA), the dates have populated as below:

SSD: 06/12/21

SAD: 08/12/21

Could you please help understand how is this possible?

Version (include the version you are using, if applicable):

21C

Code Snippet (add any code snippets that support your topic, if applicable):