Indeed, it shows that there are missing fonts when I open the linked image on Publisher. I managed to change the font of the file inside publisher itself. It would be pretty cool if an icon would appear on the figure to show that something is missing (such as fonts) to warn that it must to be manually edited. Also, for a first time using publisher and editing this, without any manual description, the process was great and I actually managed to figure it out by myself. Unexpected! Awesome job for the software designers.