Hi guys

Have an unusual issue with my polo 9n3. when i lock the doors with the remote, key, or inside of the car it doesnt actually lock the doors. The little knob goes down like its locked. But then go to open the door and it opens like its unlocked and my alarm goes off. Anyone had similar issue? Ive taken door card off and all seems ok. I tried taking the big metal plate of so i could see the mechanism but it doesnt seem like its ment to come off.

Cheers Ricky