As SCION said, this is most likely just the way mobile Adobe Digital Editions "reflows" PDFs on all devices. Sometimes this works well but often it contains various artifacts such as those you describe in the older thread.
One thing to try is to strip the DRM (
Adobe ADEPT DRM for EPUB circumvented, look at recent comments on the blog for the latest stuff including for PDFs) and then reflow the entire document by using Calibre to convert to ePub. This may do no better, but it is worth trying.