SubmitLink() is disabled successfully in object but does not behave correctly when testing on front-end sit

Hi everyone, 

I'm seeing this behaviour which I cannot explain. Could anyone recommend me a solution or reason for this behaviour?

I'm having an interface with gridField(), one of the grid column's value is richTextIcon() containing a submitLink() to kick off a process model. Please see below the code to build up my grid column: 

a!gridColumn(
          align: "CENTER",
          label: "",
          value: a!localVariables(
            local!showLink: false,
            a!richTextDisplayField(
              value: a!richTextIcon(
                caption: "Re-open Case",
                icon: "folder-open",
                link: a!submitLink(
                  showWhen: local!showLink = false(),
                  saveInto: {
                    a!startProcess(
                      processModel: cons!PRO_PM_REACTIVATE_CASE
                      processParameters: {
                        noteContent: "This case was re-activated",
                        caseId: fv!row['recordType!Test.field.caseId]
                      },
                      onSuccess: {
                        a!save(local!showLink, true)
                        
                      }
                    )
                  }
                ),
                linkStyle: "STANDALONE"
              )
            )
          )
        )

I'm expecting to disable the submit link after user clicking on the icon once. The icon was successfully disabled when I test on that interface, and behaved correctly when I tested on the parent interface also, but coming to site testing, after clicking the icon once, it is still active and I can re-click it as many times as I want. 

Does any one have any idea of how to fix this or possible solution to find the reason? Please help if you do

Thank you!