Wow, that's bizarre. Thank you for pointing it out. From doing a bit of reading it seems that Chrome (which I think you're using) is "not compliant with the PDF standards for displaying PDFs". I'm able to replicate the same problem when I try to view it using Chrome and so far I haven't been able to export the PDF in a way to get it to work as expected.
For the time being do you have a different application you can use to view the PDF?