Glyphs 2 Anchor interpolation not exact?

Is it normal, that an instance shows bad interpolation results for this?
Can it be done in another, better working way?

interpolatet (OpenType PS-no custom parameters) result :slight_smile:

That can happen because of rounding. why donโ€™t you use a component for the โ€œNโ€. The auto alignment would fix this.

sorry, wrong image. It is a component and it does not fix itโ€ฆ

Can you send me the file?