Multipage pdf export shows black/grey lines for some objects

[karen]

I have a problem on affinity designer on desktop (mac) where when exporting a file, somewhat random lines appear at the borders of some objects, like rectangles, some images etc... and it's especially a problem where i import drawings from other apps (in pdf) that have a white background, so they shouldn't have ANY type of border, and it still shows inconsistent lines around. This happens when exporting in pdf (flatten). I need the documents to be rasterised so that's the option I want to use. The files I use are created and worked on completely on affinity designer (not imported from illustrator for instance).

The file I have attached a screenshot of has NO vertical/horizontal lines around the drawings, but as you can see they are there... and this is viewed on a retina display, when another pc views this file, the lines are twice as visible. The only way I have found to resolve this problem is to export every single page separately in .jpg (since I need it to be rasterised anyway) and then making a new document with the images to create a pdf out of them. But this is only "sustainable" for documents that have few pages of course.

I hope there's something I can change in the settings to get rid of the problem!

p.s. My version of designer is up to date (1.8.6) but this has been going on for some previous versions too.

[Joachim_L]

This could be an answer.

If no, upload the ADesigner file here or if confident data ask a moderator to send you a private upload link.