Maybe it has something to do with the file so I’ve attached it if you want to try it. The section profile is for a steel perlin C-Section that I imported as a dwg file, selected all lines, used smustard weld to make curve, traced over end line to make face then save as component. When I drag in as component, I explode it, make it a group then push/pull it to required length.
c200-20h.skp (22.5 KB)