Font changes after Save As PDF

Hi, Has anyone experienced it?

My drawing font (on the sheet format and drawing) changes to Arial Narrow when Saving Drawing to PDF. It doesn't happen on all fonts e.g Calibri displays as Calibri on PDF. However when using Bahnschrift or Arial Narrow Bold, it appears as Arial Narrow on PDF. 

What's going on?

SolidworksDrawings And Detailing