Fandarel is correct: you probably need to reverse one of the pairs of wires on your GoPiGo. If you switch two that are side by side, it will reverse the direction the motor moves.
Yes, my connection is like in the image, I tried to change the position of the wires (and also I tried to change de pattern of the wires too) but the problem still exist and the robot works strange.
In the picture the motors ara changed but now the position of the motors are the same as in the picture of the web, but the wires follow the same pattern.