A train leaves a portal and its route instructions say drive via trackmark x and then drive via trackmark y and then trackmark z. The route to trackmark x is also encouraged by a directional arrow and the other choice is discouraged by a directional arrow. Yet the train takes the wrong junction completely missing the drive via command and the next one as well. First time I have seen this. I have tried about everything I can think of. Changin drivers thus rewriting the directions. Deleting the da and replacing it closer to the junction. The second train has the same instructions and follows them to the letter. Any ideas?