Interestingly, no. It really depends on the document, although I couldn't really tell for what documents it does it or not. It happens for documents of different sources (for example, a PDF book or an article), and does not happen for another book or article.
Also, when it does happen, the overall scrolling in the document is a bit laggy and unsmooth.
But I wouldn't mind disabling that feature altogether, if we can't figure out what in the PDF causes this.