For more on this, see What happens when I send my document to someone else? Will Word mess up my formatting?

You can have different printer drivers even when using the same printer on the same network! Creation of a PDF involves a similar situation. Once the pdf is created, though, it should look the same on all computers unless there are font problems.

The odd thing about this is that the pagination shifts in Word between PCs (which could be a print driver issue) BUT ALSO when creating a PDF from the SAME PC.