sara gresbach answered:
Did you check your gauge? That would be my first suggestion, to see if it is the same as the pattern. I'm not really sure that the gauge being off would cause the cable to look much different though. It is quite easy to make a mistake on the cables though, as the 2 cable rows are spaced differently and the cable needle is held on different sides of your work for both. If you want to send me a message on ravelry, my user name is addiesma, or else email me at firstname.lastname@example.org if you have any further questions about it. Hope that is of some help for you. I didn't want to go into too much detail here, but would be happy to problem solve it further if you need me to. thanks!