Downloaded Fonts No Longer Working?

Downloaded Fonts No Longer Working?

So when I logged on the other day to edit my website I noticed that all of my custom fonts no longer work. I've never had this problem before...

So far I've tried:
Reformatting the fonts through the visual editor
Deleting the fonts then re-installing them
Resetting my theme
Accessing Zoho Sites from another browser (I normally use Chrome) and from a different computer...

Does anyone know what would cause this or how to fix it? I'm not very html savvy...