Phantom CV has been an ongoing problem for a long long time now.
Usually manifests itself in one of two ways -
a) You see people taking off a landing on an invisible CV close to the one you are on. (sent film of this to Skuzzy)
b) At the extreme it has been known for a CV to be in two different places up to 12 miles apart. Got so silly one time one of the CV's was steaming through an island.