I have this question of a problem little strange, this part have two comportament, when I open in drawing and I open in detailing this part is with contours that not exist.
I will to try explain better...
Image 1, part when I open
Image2 when I see flat pattern
Image3 when I open detailing, it's strange, here I see the different geometria, as if this part had a diagonal cut
Image4 when I back the drawing this part show a diagonal cut.
Image5 It's little crazy, no?
If someone can help understand it, thank in advance.