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Downloaded font desapeared of the front panel after use it in many pages

I’m doing the “Full site build” couse.
I had download the Playfair font. I did many page with it. Now it have desapeared of the font panel and all text using it no longer have font associated.

That a problem. Is this occur often ?

Here is my site Read-Only: LINK
(how to share your site Read-Only link)