"Stuttery" variable font exported from Glyphs, smooth from fontmake

Hello. I have a strange issue where, in some environments, my exported variable font appears stuttery when displayed on a web page. When using the export from fontmake, it doesn’t stutter. Does anybody have any experience with this and knows what the issue could be?

The only differences I found:

  • the fontmake export is missing Axis Values tables in the STAT table (not good).
  • the gvar table has slightly different deltas, but nothing major.

Thanks for any pointers!

fontMake uses a different algorithm to compute the deltas.

Can you send me the .glyphs file and the two .ttf files?

Sent. Thanks a lot for having a look.