I have a logo with a multistop-gradient (with transparency) and when I export this as PDF the render is not as the original.
It is consistent though. The size of the artboard/export does not matter as does the DPI-quality. It is always cut-off on the same end.
Files attached for better debugging. Mayby it helps improving the PDF export.
http://imgur.com/19ajIlg
Affinity Designer beta 1.6.0.72
logo BeekTV-FC-Vector.afdesign