What you are describing is normal for A4/letter sized PDFs on the PRS-505. Adobe Digital Editions only reflows within each individual page. So the same headers and footers and page breaks are there as in the original, and you can often get partial screens at the end of a page. This is a design choice by Adobe, they did not have to implement reflow this way. However, since the ebook has DRM you have no choice but to use ADE to display it.
One work around is to buy Secure Adobe ePub instead when it is available. However, not all publishers even tell you whether an Adobe ebook is PDF or ePub.
If you are willing to strip DRM, another option is to buy MS Reader (LIT) or MOBI or eReader ebooks. Strip the DRM and then use Calibre to convert to LRF or ePub. Note that stripping DRM, even for personal use on ebooks you bought, is thought to be illegal in some countries. All three of these formats are intrinsically reflowable. LIT is the closest to ePub, but requires a Windows PC to download.
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