why this happen? some my fonts are available some not.
the other multilingual why not in there parent are separately
also, the letter c where is the ccedilla? are not same parent of the letter c
The auto kern algorithm will analyze your glyph outlines along with the glyph metrics. Kerning is added based on that and how glyphs pair.
You can always manually add glyphs to a glyph class.
are there is a way to add that are move away fro group and join into the parent group without a separate letter (one by one)