Are that PostScript or TrueType curves?
In Robofont they are postscript cubic curves, though it looks like Glyphs tried to convert it from truetype quadratic curves…?
Could you send a sample file to support at this domain?
The UFO you sent us contains quadratic curves, here is one excerpt:
Ah I didn’t realise this! Robofont represents the curve as a cubic bezier, even though the data is quadratic…