I also have the PS3 GOTY version, but I've never noticed this problem. This is what the UESP says about it:
"Ghosts are encountered at all levels; ancient ghosts are a somewhat stronger (more health, more powerful attacks) version. Ghosts rely upon magical attacks, in particular Frost Damage. They have both touch and targeted attacks; the touch attacks are generally immune to Silence (i.e., these spells are still effective even if a silence spell is cast on the ghost)."
----------(the text below is from a different part of the UESP than the text above)----------
"Greater and Lesser Powers are immune to Silence effects. Be aware that most Monsters and Undead have at least one power at their disposal (specified in the creatures' detailed descriptions as Immune to Silence), so Silence may have little or no effect on them."