V8 offset curve flips curve normals, randomly

I prepared a basic script in grasshopper V7 which works perfectly: It’s a basic facade build up from curves and offset curves.

However, the same script behaves differently in V8. Some offset curves have flipped normals which creates messy lofts. Is this a known issue?

Ill upload the scripts. when I am near my computer again.
facade-boxes_V7.gh (56.3 KB)
facade-boxes_V8.gh (53.3 KB)