If the exported karaoke video shows the wrong font, the file name of the font on disk probably doesn’t match the font’s internal name.
Example: a font whose internal name is Century Gothic but whose file is
GOTHIC.TTF. Renaming the file to Century Gothic.TTF fixes the mismatch.
Steps to fix
Locate the font file
Find the font file on your system (for example, GOTHIC.TTF).
Rename the file
Rename it to match the font’s display name exactly (for example, Century Gothic.TTF).
Reinstall the font
Install the renamed font on your operating system.
Restart Youka
Quit and reopen Youka so it picks up the renamed font.
Re-select the font
In the Style Editor, choose the renamed font from the list and save.
Re-export
Export the karaoke video again to confirm the fix.