Multiple Master Curved Path Conflicts

Hi, I’m trying to create a variable font.
Does anyone have an idea what the problem with this multiple master glyph could be?
Does it have to do with the changing curve direction?

Different number of points?

Please read the Multiple Masters Tutorial about keeping your outlines compatible.

Thank you, I had the same number of points in the monoline font and with the conversion incompatible extra points were added. I didn’t realize that until now.