here are 168 contours with 11 frames each. If I change the direction of contours, they look fine, 168 lines. Now change the count in horizontal frames to 11 and I end up with: 20 frames. There are 168 list items, but all with 0 values inside, except the second one which has 9 values and the third one which has 11 values. Makes no sense at all!
I will attach the grasshopper file, you can have a little play yourself.…