I think I've found the cause of the ghost markers.

Goto the following site where you can see the map with object too:
http://aprs.fi/

If you zoom out far then you will see polygons for specific places where a 
lot of activity is shown. The markers are not shown then so some kind of 
clustering. At some places there a less places and you will markers and 
polygons together. 
The polygons are mayby not recognised correctly by the google earth plugin 
and are translated to a 'ghost' marker.

Other option is that the makers have labels and that are seperate objects 
in the kml file and on the map. Maybe these can also be translated to a 
'ghost' marker.

Does this make sense?

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