In the wiring diagram "KL4030 driver" you are showing pins 2 and 3 wired down to your driver card from the breakout board. You do not have a connection for the signal ground connection (the pin between pins 2 and 3). This ground pin is from the computer and connects it to the rest of your circuit, so should be connected somewhere.
One my cards (Stepmaster) there is a signal ground connection to do this, on the driver card.