# G4: Interpolate metrics issue

**URL:** <https://forum.glyphsapp.com/t/g4-interpolate-metrics-issue/37228>\
**Category:** Glyphs\
**Tags:** bug\
**Created:** [September 8, 2026, 9:30am UTC](https://forum.glyphsapp.com/t/g4-interpolate-metrics-issue/37228 "2026-09-08T09:30:54Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![elena](https://forum.glyphsapp.com/user_avatar/forum.glyphsapp.com/elena/32/468_2.png) [@elena](https://forum.glyphsapp.com/u/elena)\
**Post date:** [September 8, 2026, 9:30am UTC](https://forum.glyphsapp.com/t/g4-interpolate-metrics-issue/37228/1 "2026-09-08T09:30:54Z")

</div>

The Light master LB=20, the Black master LB=12. Interpolate metrics for intermediate Regular master gives LB=24.  
Corner components are not respected? the X position of the first node seems to be correct (after Interpolate metrics applied) – 96-90-81 (Light-Regular-Black)