Lines disappearing, why?

Hey! I have a question about my font in Glyphs. When saving my font - the small, thin lines disappeared and only saved the thicker outlines. Why is that happening? Appreciate the help, thanks! /Lou (rookie)

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In OpenType fonts, you can only have closed paths, not single outlines. What you can do is to offset curve the thin lines be a few unites with the make stroke option.

Big thanks!!