If you open the fonts in either Glyphs of FontLab you will see, that the paths are doubled up. That means they are not open but just have not area between them.
What version of Glyphs do you have?If you open the fonts in either Glyphs of FontLab you will see, that the paths are doubled up. That means they are not open but just have not area between them.
What version of Glyphs do you have?