Try this?
Select the Menu button in the top-right corner of the browser window or press Alt + F on your keyboard. ...
Click Appearance on the left-hand side then click Customise fonts on the right.
Use the drop-down menus to choose which fonts to use for the Standard, Serif, San-serif and Fixed-width styles.
Or...
Possibly there is a problem with the font on your machine. Check what font the site is using and reinstall it on your machine. This is the answer. If you're tech-savvy enough, right-click > Inspect Element to find out the font, then uninstall and reinstall on your computer.
Or...
Just click the icon next to the address bar and change the size, font, style, or weight. You can also choose your own font (eg. a .ttf TrueType Font file) and use that.
Posting excessive nonsense irritates Stummy! ?