Why If statement is repeat for twice?

I have a "if" or "case" statement in the a method that I can called. I have "Flag" varriable as public status. Its Crazy its loop/running for twice, so cause have duplicate command, in these case I have duplicate data on the database.

 Public Sub compartment1(ByVal exec As Boolean)
    Try
         If exec = True Then
             Select Case FlagMark
                Case 1

                     Insert database execute command

                Case 2
                     another command
            End Select

        ElseIf exec = False Then

        End If
    Catch ex As Exception

    End Try
End Sub

And this is my button command

Private Sub cmd_confirm_Click(sender As Object, e As EventArgs) Handles cmd_confirm.Click  

If pCheck2.Checked = True Then

               FlagMark = 1
               compartment1(True)

End If

End Sub

The Method "Compartment1" is running twice, look like looping, so I have a duplicate data or duplicate for single command. Can it running only once?