Libre Office doesn't convert the ppsx file to pdf properly

The text is clipped off when i convert from ppsx to pdf file.I used Keynote to export the same to pdf and it exported without clipping off the text.
Libre Office displays the ppsx properly only when the OpenGL rendering is enabled in the view tab. However, I’m not sure how to export it correctly.

Heh. Please attach a sample PPTX, and PDFs, instead of screenshots that allow nothing for those who might test to help you.

PPSX == PowerPoint Open XML Slide Show