Variable Font Export Problem

I wanted to export one of my fonts as a variable font and I am getting some wierd behaviour.

The „U“ does not interpolate correctly as a variable font. Creating the instances normally as an otf did not result in the same problems. At first I thought the problem was my assymmetrical multiple master setup.

I however still ran into the same problem, when I made it symmetrical.

Debug.zip (19.3 KB)