[Python] Fontforge - Why is the GPOS pairing not working when there are two subsequent kerned...

I'm trying to fix kerning in a font. It works fine except if there are two kerned glyphs after each other, see picture.

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This is the code I use

if abs(round_kerning_value) > 20:
left_glyph.addPosSub(subtable_name, right_glyph_name,
0, 0, 0, 0, # No change to first glyph
round_kerning_value, 0, round_kerning_value, 0) # Apply kerning to second glyph


This is the relevant part of the docs. https://fontforge.org/docs/scripting/python/fontforge.html#font

glyph.addPosSub(subtable_name, other_glyph_name, xoff1, yoff1, xadv1, yadv1, xoff2, yoff2, xadv2, yadv2)


What am I doing wrong?

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