Is this normal on a 06 Jetta?
 

Hi everyone.

I notice that on the passenger side, when I press the "lock door" button and close the door, it will lock all 4 doors.

When I press the "lock door" button on the rear driver side and close the door, it will ONLY lock that door.

When I press the "lock door" button on the rear passenger side and close the door, it will ONLY lock that door.

But when I press the "lock door" button on the driver's side and close the door, it will lock all doors, EXCEPT the driver's side.

Is this normal? Why does the passenger side lock all 4 doors, but the rest does not?

thanks