Today at work I encountered this problem while making PDF's of charts for a print publication. The Mac version of Excel is not able to produce proper PDF's! Look at the wonky kerning of the numbers under these charts, and the wobbly dotted lines. Compare them to the perfect kerning in the Excel for Windows 2017 PDF export...!
The same sheet was used for this export. First I thought it was the zoom level of Adobe Acrobat interferring with the pixel mapping of my screen but it is not, the PDFs are just jiggy and messy when exported on a Mac. I hope this feature will see a fix, cause producing PDFs is an important part of my workflow, and I would love to use Excel on my Mac instead of on a virtual windows PC.