Black lines when creating pdf from story-mode

[Bobi]

Hi. I have the problem that I get ugly black lines when I am exporting inserted sheets to pdf from the story-mode. See the black lines below.  I found this link related to the topic:

https://helpx.adobe.com/indesign/kb/thin-white-dark-lines-stitching.html

Doesn´t seem to help when I am opening through browser (chrome) though. Anyone experienced this and have a solution for it?