Code missions: Can build direction change with complexity?

[Grauniad]

Just tried to play the code map for today (Very hard on Med/High) and when I tried on Med/Low, I noticed that the build direction has changed/ Is this WAD or a bug?

[Crimson King]

I've seen this on numerous maps and appears to be by design that the build direction can change based on map size/complexity.

[knucracker]

It's more WAC than WAD... it was one of those things where I just let the river flow where it wanted rather than fight it.