Workflow Approval for Position DFF not working as expected

In the Position screen, we have configured a DFF, called Validation Metier, and has 3 List of Values (Avec circuit de validation,Sans circuit de validation,Validation déjà obtenue). The value of the DFF is stored in Attribute3 column.

We have configured Approval Workflow for feature, Request a New Position.

The rules are as below:

Rule 1 - DemandePoste:

((transactionApprovalRequest.attribute3 != "Sans circuit de validation") OR (transactionApprovalRequest.attribute3 != "Validation déjà obtenue")), approval is directed to the Representative

Rule 2 - SansValidation:

((transactionApprovalRequest.attribute3 == "Sans circuit de validation") OR (transactionApprovalRequest.attribute3 == "Validation déjà obtenue")), the rule is Auto-Approve

When Request for a New Position is submitted, with DFF having value "Sans circuit de validation", we expect the workflow to be Auto-Approved