Seniority Date rule not visible for every employee

Summary:

Hello,

We have created in the Seniority Date V3 , 2 rule to calculate the seniority date with the same set up in terms of display. But when we want to change the seniority date , only one rule is showing for most of the employee and sometime the second rule also appears for employee.
Could you please help me understand how it works?

Thanks

Regards

Lucie

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Example of another employee

Example for one employee

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