The Cards have a Field with a Font Type set to “Yu Gothic UI”. In the Browser the Field is shown correctly (Windows and Android). However in the Preview and in the Review, the Field is shown in a Fallback Font Style (Windows), although the Font is installed in the System. This Issue does not occur on Android. Tried different Font Styles, it seems that all Yu Gothic and Yu Medium Font Styles are affected.
Anki Version 2.1.49 (dc80804a)