Why do some of your fonts display in gibberish?

Fonts may display in gibberish due to issues such as missing font files, incorrect encoding, or unsupported characters. If the font is not installed on the system or the application cannot access it, fallback fonts may render the text incorrectly. Additionally, using the wrong character set or language settings can lead to misinterpretation of the text, resulting in gibberish output. Lastly, corrupted font files can also cause this issue.