I recently purchased 6x NEMA 17 42HB34F08AB for my Rubik Cube Solver robot. On the webpage they said they are rated for 1.33A/phase current but while I try to measure the current underload I got 0.25A max. I don't know where does this problem come from or what am I doing wrong. I am using A4988 drivers and the potentiometer isn't changing the current at all. The steppers were working okay but the problem comes from the fact that after a while the arduino jumpers started to burn the plastic. I plugged the power supply (12V 8.5A) cables to back of a breadboard (see in picture). Could it be the cause of the problem? If so is the only other solution to make my own PCB?
Thank you for reading!