Heya - i had a simular problem with a pc monitor just today.
Seems that the svga monitor cord they sent with it was crap. It was like half as big arround as the other cords i have - and after i swapped it out - there was no more ghosting.
your wire gauge may be too thin... and or maybe it also needs those anti noise shields. I think some cords have foil arround each wire - and also have the anti noise filters sealed into the ends of the cords. These prevent cross talk and interference from other electronic sources.
Good Luck,
Steve
: )