Have searched on the forum for this but was unable to find a similar issue. Am a very entry level user…
Paths in Glyphs appear ok (left), exported TTF used in Illustrator, outlined to show path (right)
The curve in the top right has an inflection (meaning it changes direction in the middle). Normally the TrueType export should take care of this. But you can try to add one manually (use the pen tool and press the Shift key while adding the point.
And have you tried to export as CFF/Postscript?
Can you send me that glyphs file that I can check the TreuType export?
That is an interesting error in Illustrators. The kink is not only with the TrueType font, but also when converting to outlines.
It goes way when I disable the GPU rendering in Preferences > Performance (In my German Illustrator it is “Leistung > GPU-Leistung”). So it seems to be a problem with the GPU render.