Interpolated Nudge: Not interpolating properly

[Hurme]

When trying to transform a large group of points, results are very weird. Here’s before and after screenshots of points moved down. Only two arcs on the bottom of the shape should have been interpolated. The other outlines should have been just moved down as they are. Instead, they are badly kinked and deformed.

BEFORE:

AFTER:

Glyphs file:
Interpolate_Toni.glyphs.zip