Inaccurate glyphs shape via intermediate layer

Hi
when i add an intermediate layer for several glyphs of my typeface, the results are wrong. i don’t know if i did it right or not.

the intermediate layer position is:(red circles are designed masters and numbers are [wght,slnt,opsz]):

designed glyph(the glyph size is equal to the others):

result:
ezgif.com-video-to-gif

You need to always have a layer/master on all corners between the origin and the layer. In you r case you need something at all corners of the cube.

i added intermediate layer for the rest of corners and it works now. thank you.