GN4, for the typeface style purpose (bold/italic), allows that only one member of the font family marked as bold, only one member of the font family marked as italic, and only one member of the font family marked as bold italic. If more family members are marked as either bold, italic or bold italic, various misbehavior may occur.

The problem may happen during fonts import, if the font family contains more than 4 members.

In such case, assign some fonts a different font family. Have in mind that the font family is used in GN4 only for typeface style.

An example: The font family FranklinGothicStd contains 10 members (Book, Demi, Heavy), whereas two members are marked as bold, two as italic, and two as bold italic. This was causing the change of the Roman font when applying bold by SHIFT+CTRL+B. The solution was to move the Demi and Heavy members to a new family FranklinGothicDemi and FranklinGothicHvy, in the way that each family had only one member marked as bold.

An example of a correct configuration

In the below configuration, the settings are correct, because there's only one member set to bold only, only one set to bold and italic, and only one set to italic only.

An example of a bad configuration

In the below configuration there are two members that are bold only (8052 and 10003), two bold italics and two italics, all members of the same Arial family. That is definitively wrong setting.