Lamke

The other day i was driving a group members Box Truck, i was probably about 6km away from him when i got pulled over. As soon as i stepped out of the vehicle it just disappeared. The cops swore it wasn't them. And this has happened probably another 4 times now since then. If we don't use the vehicles for more than 5-10 minutes they'll just disappear even if we're right beside them. Is this a server anti lag thing, a bug, or are we just stupid?