Much as I'd love to help, there is just so little information in what you just described that I'm unable to offer any suggestions. I've no idea how you're using schCreateWire, what pin 0 and pin 7 are, what the two instances are and so on. Since schCreateWire is done by creating a wire between coordinates, I can't see how anything would be random.
Without seeing your code, it's really hard to comment. Even with the code it may be hard without seeing the data - so a picture might help (I've used pict.com to upload pictures and then you can easily link to them from here using the little image icon - the picture of a tree).