I haven't done anything for a while with long strips but I do remember being told to alternate the direction. Some quilts you can do the small sections of two strips to two strips etc but with a trip around the world I think it would be even more confusing if you didn't stay in order. My advice is to check it and if it's off much take it out. If it's just a smidge off start at the other end for two rows, then start alternating again. When I made mine, and we are really going back here. We sewed the long strips to the next which was two sections shorter but we notched the strips at the place where they would be later cut and I guess that kept the rows straight. I made three right in a row because I liked the pattern t so well and haven't done another since. but it's on my TO DO LIST.