This can be due to not having a value set to the font field inside Unity. Or if the same font is used on multiple fields.
- Make sure that a font asset is added to the field in the Unity inspector. (Example below)
- If trying to expose multiple font fields in Creative Suite, Eg. one for Latin, one for Chinese etc. Inside Unity, a unique font will need to be added for each field in the inspector. Duplicate the font and name is differently, such as font1, font2 etc. Then add each font into the inspector fields so that the same font isn't getting applied.