Most systems with EFI contain an EFI system partition as well as the user-defined ones, and that might be throwing off the numbering, and in addition there's the question of the GPT partition wrapper.

Current versions of corporate genuine Ghost do understand GPT but older ones didn't, so depending on exactly what the state of the machine was before you took the image, it may be imaging the GPT wrapper instead. Boot Camp tends to fiddle with the outer MBR wrapper in order to boot XP since XP isn't GPT-aware, but I don't think it will have put the OSX partition into the outer wrapper. So, the numbering depends on how Boot Camp fiddled the MBR to expose the GPT partitions before you ran the image.

It's entirely possible that what Ghost is seeing as partition 2 is the GPT wrapper, hence the result. You should really dump the partition layout using gdisk on the machine first to see what your version of Ghost sees, which will be entirely up to whatever subset of the GPT partitions Boot Camp has exposed in the outer MBR.