I've seen a similar bug to this when building walls, but usually the transparent build is where the wall would've otherwise placed. This one is just whack. There's a cone where the ramp is and the cone that i'm editing isn't greyed out and is actually being pre-edited.
This style of editing bug where I end up pre-editing instead of editing a build is becoming increasingly common and I would really like to see this fixed /u/epicboaty