I can still reproduce this if I log in as you, but only in Chrome on OS X. Using Chrome on Windows, I can't reproduce the problem.
It's all down to differences in font rendering. If there is any difference in the font, that will change the size of words and therefore it will affect how many pages your PDF is split across. You're seeing the preview generated in your browser of course, but the PDF itself is generated on our servers, so there is always the potential for this to occur.
Our servers run on Windows, which explains why the generated PDF matches the number of pages I see in Chrome on Windows, and I only see a difference when using OS X.
It just so happens that the current content of your CV means it's borderline whether it will take up two pages or three!