What's the problem with web fonts?

Question

Fonts

Firefox gave font errors.
The question is - what does this mean and what to do?
Previously, the same fonts worked and there were no errors.
Fonts on the site are displayed normally.
In total, about 300 fonts are connected in this way, but these three cause an error

Answer 1

Why is the folder named in Cyrillic? I'm going into this business. Or renamed. Or removed.
Are they displayed properly? There may be a cache, but in fact there are no fonts anymore.