The autorouter has done exactly what it is asked to do--connect some points together. It is not designed to read your mind. If you have very specific requirements, there are rules that can help force the autorouter to think like you (for instance, defining differential pairs), but it's not you. That's why if you have a critical path you should route it manually. Autorouters are not perfect; they are better than they used to be, but, still, I often route a large portion of my designs by hand.