Cap-Component problem

I know, its not the intended use for this components, but I see no reason, why it should not work. But it does not. What did I make wrong?

Glyph:

(widths of the stem is exactly the same as the component stem in all masters)

Component:

the end of the stroke is absolutely horizontal in all masters, but is not in some instances. Actually, the component is distorted completely. Any Tips?

Detail:

Could you send me that file?

This seems to be a rounding error in the Preview (I fixed it). Final exported fonts should be fine. You can set the alignment to not rotate (the “X” in the info box) to make sure it is not transformed.

Bildschirmfoto 2023-05-09 um 10.48.05

Fine. Thanks!