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How about using a different position on the controller board? I really don't see what else it could be, unless maybe your wires are picking up noise from somewhere and transmitting it to the driver.
Try swapping drivers then and see if it follows the driver chip.
If it's stepping back and forth instead of just in one direction, you probably have it connected wrong, or the motor wires are wrong. If it's stepping in one direction but different amounts, I'm not sure. Maybe try swapping motors to see what happens, if it follows the motor or the driver.
Yeah I think the servo pins aren't being used. I don't remember the pin number, but you should be able to find it in the pin configuration or ask someone which pin they used for the servos
Check out this other instructable someone else did for additional information:https://www.instructables.com/id/RGB-STEEL-Low-Cost-Steel-Frame-Color-3D-Printer/?ALLSTEPS
Yep, thats more than enough
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