Hi,
Thanks for the scene, it's very helpful. I can see the problem . It seems the count for the sequence operator on the Y axis is ignoring segments that are outside of the clipped area, so it always starts counting from the first visible tile in the array . This doesn't seem to happen on the X axis. I'm going to send this to our development team, I suspect it might be a bug. I'll get back to you here soon.
Thanks,
Paul