I have an issue with PowerBI's rendering of PDF files.
Firstly there seems to be an issue with how PowerBi is creating the PDF export and secondly how it is then displayed in your choice of PDF viewer. Below I’ve taken the screenshot of the original online version of the report and compared it to how it looks on every possible program I can open a PDF with. There's a wide variety of thickness changes, lines omitted, "wobbles" in straight lines and random lines appearing that weere not in the original. The most bizarre result is Adobe Acrobat which is changing it’s mind on the lines depending on how zoomed in you go. Screenshots of the extract on each system is shown below.
PDF Opened in Chrome:
PDF Opened in Edge:
PDF opened in Firefox:
PDF Opened in Adobe Acrobat at 80.4% size:
PDF in Adobe Acrobat increased to 100% size:
PDF in Adobe Acrobat increased to 125% size: