Stumbled against this issue. Not sure if I did something wrong. I checked it a few times and the surface should be flat because it is going towards one direction. This is just extrude cut feature not following any curves. Funny enough is when I wanted to cut along a curve with extrude loft, it didn't worked and now I'm getting this curve with extruded cut.
Anybody experienced this issue before?
( PLEASE FIND FILE IN ATTACHMENT ... )