Generating precomposed fractions

I followed the fractions tutorial, and get wrong metrics when generating precomposed fractions. In the second row an example build with the fractions OT feature. What went wrong when generating

?

Where do you see that? In Glyphs or with the exported font (if so, what format)?

In Glyphs 3 latest version

Can you send me that .glyphs file?

Any reason you have automatic alignment disabled in font info?

Yes. It is a pure components based type, the modules wouldn’t fit as wished if aligned automatically. But thanks, I forgot that for the prebuild fractions it is necessary.