the one on the left is way stretched. you can fix this by moving the light closer. within 3 inches should be fine with a fan but not too close as the "head" of the plant is still tiny. also add more soil to the top to bury the stretched part of the stem. if you move the light and bury the stem the stretching will stop and the growth will catch up to itself in a few days. i would also add more light if you could, although for the time being your light should be fine. once growth takes off definitely get more light though.