The Current git-version of okular-frameworks produces sometimes some wrong output. Pages that should be A4 are scaled very badly (see attached file). Happens only sometimes, but then nothing helps, e.g., restarting okular, trying another document, etc. Reproducible: Sometimes http://ctan.math.washington.edu/tex-archive/macros/latex/contrib/pdfpages/pdfpages.pdf
Created attachment 93480 [details] okular showing pdf with wrong scaling
on the other hand. printing is fine!
Doesn't happen to me using the latest version from the frameworks branch and your file. Closing the bug. Feel free to reopen if you can reproduce it with a recent build.