This is normal for a PDF. The reflowing is one page at a time, so at a minimum you get partially blank screens every so often (at the end of a physical page). Sometimes removing line breaks does not work, and paragraph detection can be hit and miss.
When there is a choice, buy Adobe ePub instead. This is what you get from the Sony store. In general, an ebook sold as "Adobe Digital Editions" will likely be PDF.
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