1:24 AM, Saturday June 13th 2020
It's similar to what is shown here, in that it strays from the vanishing point, which it will do, since it's highlighting an error in the way you've drawn your ellipse compared to the true minor axis (the one that you draw through the middle of the box). If you mean that it's not connecting back to the minor axis line you drew, then yeah, I probably should've when I drew the example.