Some fonts appear doubled when printed as PDF

Hi,

I have a weird issue where one piece of text using a Google Font appears twice when printed as PDF.

I created a simple html file for demo purposes:
```html

@import url('https://fonts.googleapis.com/css?family=IBM+Plex+Serif&display=swap');
#doubled {
font-family: 'IBM Plex Serif', serif;
}
#not-doubled {
font-family: Helvetica, sans-serif;
}

Font Printing issue

Title in 'IBM Plex Serif' from Google Fonts that will be doubled

Title in 'Helvetica' that will not be doubled

```
Then I simply perform a 'print as pdf' (either using the browser dialog or the one from macOS)
- Chrome (79.0.3945.130): no issue
- Edge (79.0.309.68): no issue
- Safari (13.0.4 (15608.4.9.1.3): the font is doubled
- Firefox (72.0.2): the font is doubled

Here are some zoomed-in screenshots:

### Chrome ✅ :
### Edge ✅ :
### Safari ❌ :
### Firefox ❌ :

You can see that the word `doubled` is made of 2 words stacked.
It feels like this could be a browser issue maybe?

Thanks a lot for any help on this.